TRIMS

The elimination of market interventions and more liberalization has a positive effect on FDI inflows. According to Zhang &Yang (2016) the importance of WTO with regard to FDI has been overlooked by the previous researchers and until now its effect on FDI and that On Trade related investment measures (TRIMS) has not been examined. Sane (2015) study suggests that it is important for national governments and for those firms that are involved in formulating investment, business and trade policies to know the effect of TRIMS on the foreign investment. It is the responsibility of WTO member to remove tariffs and other barriers that can affect the foreign as well as local investors. In order to attract more FDI in various sectors, locations and activities the overseas investors are offered with incentives. These incentives can in the form of tax credits, concessions, holidays, export subsidies, export subsidies and accelerated depreciation on machinery and plants. (Shah & Khan, 2016). Milner (2014) states that the most common feature that have been affecting the maneuvers of multinational firms in the host country are the rewards and punishment approach. Furthermore, the main purpose of Trade related investment measures is to abolish such kind of approach. In case of any dispute between two-member countries the WTO has dispute settlement mechanism from one state to other. (Shah, 2010). The decisions related to settlement of dispute does not require harmony among the members. (Shah, 2011a).According to Barry et al. (2016) previous studies indicate that multinational overseas investment is affected by high tariff barriers.Shah(2017a) found that rapid reduction of tariff duties in the late eighties that in early nineties and eventually due to the agreement of WTO in1995 led to tariff jumping FDI. This kind of investment is not present in free market economies. (Medvedev, 2012) With The internationalization of multinational productions competition for FDI has become more business friendly economic atmosphere which is in accordance with the objectives of W TO. (Paul, 2015). By observing the Present & the likely future factors that can affect the FDI movements this will help to create a market that is free of any interventions which would in turn attract more investment (Sutyrin, Efinova & Trofimenko, 2016). This study aims to determine the effect of TRIMs on overseas investment in 38 Sub-Saharan African countries from years1988 to 2015 i.e. 28 years .The variables used are market size, economic development, infrastructure, macro-economic stability. The results indicate that TRIMS have positive impact on FDI inflows. The conventional determinants of FDI consists of Market size, Trade openness, Economic Development, Macroeconomic stability and Infrastructure ability and Quality. These are considered as the main factors that have major influence on inward FDI.Balasubramanyam ( 1991) defined TRIMS as both collection of incentives & restrictive measures that are designed by a developing country in order to influence of FDI.To control the use of performance requirements that are imposed on foreign investors by means of WTO TRIMS. (Collins,2016). These agreements are a combination of both new and existing investments and includes both native & foreign firms. (Shah,2011b).The member states of WTO are required to notify about the procedures that do not comply with the TRIM agreement in 3 months' time period. To eliminate all kind of distortions the members of developed countries are granted two years' time, the developing countries five years and the low developed countries up to seven years. The developing countries that are unable to implement TRIM within the given time frame can get more time by applying for extension within seven years for Pakistan and few months for Chile. (UNCTAD, 2012).The amount of trade agreements that are signed by a developing country are taken as proxy for TRIMS. Moreover, these agreements involve two or few partner economies they focus more to tariff and service liberalization. TRIMS is very crucial for FDI due to removal of non-tariff barriers in trade. It allows overseas investors to freely export, import goods and generate profits. It gives all the investors equal treatment irrespective of their nationality. Impartial investment policies are more favorable for enticing foreign investors and tend to have a positive relationship between TRIMS & FDI inflows. (Shah, 2012a).ESTIMATION METHODShah(2017) used equation one for determining the effect of TRIMs implementation under WTO on inward FDI in 38 Sub-Saharan African countries.FDI it=f(Market size, economic development, openness, Macroeconomic stability, Infrastructure, TRIMS) †¦..Equation 1†³In equation one subscript i represents a Sub-Saharan African country from 1 to 38. Subscript t denotes the time period from 1988 to 2015 varying from 1 to 28which is equal to a total of 1064 (28*38) observations per variable. FDIit is used for the dependent variable representing the yearly stock of FDI in each of the host economy i.† Equation two is derived from equation 1 by using log and by putting the proxies for dependent and independent variables. Where, ln is used for natural log, which also reduces the likely heteroscedasticity (Resmini, 2000). For market size Gross domestic product is used. The gross fixed capital formation proxy is used for development level, aggregate trade represents the extent of openness of the economy, exchange rate is used for macroeconomic stability and for infrastructure availability telephone density is used. The WTO membership and the trade agreements proxy represents TRIMs implementation.Empirical Estimation MethodShah, (2012b) used longitudinal panel for data from 38 countries for 28 years. Hausman (1978) specification test was carried out to select between fixed and random effect and the use of fixed effect model was found more appropriate. (Nonnenberg & Mendonca, 2004).RESULTS AND DISCUSSIONThe market size variable (GDP) is positive and was found to have significant effect on FDI. Shah (2016) found the results to be in accordance with the theory since economies of scale, opportunities for diversification and more possibilities of making an optimal use of the imported technology are usually offered by bigger markets. Economic development (GFCF) is positive but insignificant.Trade openness was positively significant which indicate that multinationals prefer open economies. Macroeconomic stability is found by the exchange rate. The result reveals that FDI in the Sub Saharan Africa is based more on exports due to depreciation of currency. Infrastructure and quality are positively significant as these are considered more important for the production and trade related activities. The proxy for TRIMS is the no of trade agreements and that of WTO membership is positive and significant which indicates that the amount of trade agreements signed by the host results in increase in inward FDI.CONCLUSIONThe main aim of this research is to determine the effect of TRIMs implementation on FDI inflows in Sub-Saharan African Developing countries. The technique used for data analysis was fixed estimation for the years 1988 to 2015 which shows that presence of larger domestic market attracts multinationals (Shah & Afridi, 2015). Trade liberalization enables the multinationals to sell their products in other countries.The important factors affecting FDI are Infrastructure, trade liberalisation and exchange rate. These factors tend to influence the overseas investors' investment decision because they empower the multinationals. Reduction in TRIMs related market distortions positively affects multinationals due to the resultant liberalisation of the trade and investment environment adding to a country's prospects of hosting additional FDI. Economy development was found to be insignificant due to the relative backwardness of the economies under investigation. These results are applicable to the 38 Sub-Saharan African countries only and shall not be widespread universally to other countries.

Carter Unsuccessful Re-Election 1980’s Essay

Why was Carter unsuccessful in his attempt to secure re-election in 1980? Jimmy Carter was the first elected President in half a century who failed to win a second term. His election in 1976 was set during the period of time when people had lost their faith in the presidency. After Nixon’s humiliation considering Watergate scandal and Ford’s simplistic and unenthusiastic govern, people were looking for someone outside Washington’s corruption. Carter seemed a perfect decision , governor of a small state, he appealed to people as the best solution. Nevertheless, as they got what they wanted it turned out to be wrong. They got a person from the outside that had no idea how Washington worked. People believed he was error prone and inexperienced. Carter soon became a joke and was criticized by the society that was not willing to give their votes for his re-election. Carter made several crucial mistakes during his power. From the beginning of his presidency he was accused of micro-management. This was one of his strategic errors, he tried to do too much too quickly and paid attention to small details forgetting the big picture and failing to grasp the complexity of the plans that he proposed. It is said that he managed the rota for the White House personally. An NSC member said: â€Å"If Carter saw a problem he wanted to solve it, and there was all there was to it – no prioritizations†. His short sight pushed the voters away. People were not eager to vote for someone who would get absorbed in small things, rather than looking at serious problems like inflation, which Carter had inherited. His other mistake was rejecting all the help, including Congress’s. Carter had originally run on an anti- Washington platform, of course that was the reason he got elected; nevertheless it is hard to run a country when you have tension between the President and Congress. Therefore Carter never developed a solid base of supporters on Capitol Hill. Speaker Tip O’Neil was willing to help, however Carter who said that he had been a governor and knew how to deal with legislation rejected his proposal. Carter’s poor communication with Congress got him nowhere. Carter failed to get cooperation from Congress to pass certain legislations, such as his energy program. Americans understood that a stubborn President wouldn’t bring any good to the country; Carter’s personal loyalties made voters doubt his wisdom and retrieve their votes for someone better. His other failure overshadowed everything that he has done as a president. The â€Å"Billygate† scandal had harmed Carters reputation and even lowered his chances of being re-elected. He won his first election in 1976 because people thought he was unaffected by Washington’s corruption, however this scandal highlighted Carters use of presidential power in his own benefit. Carter’s older brother Billy was a redneck; who, in July 1980, registered as a foreign agent and received a $220,000 loan from the Libyan government. It raised a political storm and later on through the investigation it was revealed that Carter used Billy’s Libyan contacts to free the Iranian hostages. President Carter was accused of nepotism however public decided that he was incompetent rather than corrupt but this scandal cost Carter his popularity rating and votes. Nonetheless, some of the negative events that occurred during Carters presidency were not his fault yet he got the blame. A first example would be the energy crises, which was beyond Carters control. Increase of car use, one harsh winter and poor relationship with Middle East were the reason for it, but still Carter was accused. Carter attempted to propose energy legislation, however Congress changed it beyond recognition. The only conclusion was to raise the price for the fuel but people were unwilling to go that far. Voters were unimpressed by the President’s handling of this situation, which soon got even worse and caused even more dissatisfaction from people. The second example is the economy, which was the problem throughout Carter’s presidency yet was a mere question of luck. He inherited inflation, unemployment and rising aging population. 63 per cent of the Americans believed that inflation was their greatest concern yet Carter was not managing it; only 32 per cent approved of his actions. The unemployment was rising to 8.2 million and businesses feared that Carter’s energy proposal would damage the industry. Carter did not know how to handle these types of situation; being all his life a governor of small Georgia he now faced a major crisis. Carter was at the top and therefore blamed, he was simply unlucky. Yet this blame and dissatisfaction cost him votes. Carter also displeased the voters with the way he handled foreign policy. As a President, Carter decided that it was morally right to give Panama Canal over to Panama. He did it with little resistance, which displeased voters and Congress. His other mistake was accepting 125,000 Cuban refugees who were dissatisfied with Communist regime, although March 1980 Refugee Act said that no more than 19,000 were allowed to enter. It was morally right to let the people in and perhaps he would have been accused if he closed the doors for them, yet politics sometimes tend to forget about moral rules in times of crisis. With inflation and unemployment, new citizens were only burdens and caused further disagreement with Carter’s way of running the country. His final concern that had taken all Carter’s attention until his last day as a President was the 60 American hostages in Iran. Many Americans felt powerless and 50 per cent of them thought Carter was too soft with Iran. Carter had a choice; either to take hostages back with violence or with negotiation. He chose a more diplomatic way not wanting to risk lives, however back than people disapproved of this act. When finally Carter agreed on the rescue mission, helicopters that were sent into Iran failed. Eight Americans died, one helicopter was lost in sand storm another failed and set the others on fire. Technical and weather problems were not Carter’s fault yet his failed rescue mission caused Carter’s defeat and helped Republican to use the hostage crisis for votes. The final reason for Carters defeat was his opposition. Ronald Reagan was underestimated by Carter, yet adored by the people. The way he presented himself was the way a true President had to be. His lighthearted jokes and charisma made him come across warmer to voters than Carter. Reagan’s rhetorical question â€Å"is America better off than it was four years ago?† was highly effective and the polls showed that he won the debate. Back in 1980, people believed that Carter was one of the worst presidents they had, yet as the years past people began to justify his acts. He was not great but he did what he could, he was just unlucky. His failures were because Washington was unknown to him and he did things how he usually used to do the back in his state. His big mistake was â€Å"Billygate† and economical crisis, which was not under his control. Reagan compared to Carter presented a true picture of successful presidency. Unfortunately Carter was not what people wanted and some of his failed actions cost him his re-election.

A Paper on the Market Pull and Technology Push Factors

I will be reporting on just one of 3M’s many innovative products the post-it notes. I will also highlight the market pull and technology push factors that were considered in developing the innovation. The key terms to be identified in this report are innovation, technology push, and market pull. Innovation refers both to the output and the process of arriving at a technically feasible solution to a problem triggered by a technological opportunity or customer need. Technology push describes a situation where an emerging technology or a new combination of existing technologies provide the driving force for an innovative product and problem solution in the market place. Market pull is the advancement of technology oriented primarily toward a specific market need. Post-it notes are pieces of stationery with a re-usable adhesive strip on the back, designed for temporarily attaching notes to documents and other surfaces. The release of post-it notes in 1980 in the United States was one that was not only innovative for its time but one which captured the needs of consumers in a whole new way. Post-it note became a big success for 3M and was adored by customers. The first and probably most important technology push that resulted in post-it notes is senior scientist Spencer Silver’s 1968 discovery of an adhesive that didn’t act like any others. Instead of forming a film, it is a clear, reusable and pressure-sensitive adhesive. For five years, Silver promoted his invention within 3M, both informally and through seminars, but without much success. In 1974 Art fry perceived the idea of coating the adhesive on paper. He soon realized that this technology would serve well as a note pad. 3M conducted a direct-mail program to the secretaries of CEOs of Fortune 100 companies, and got back letters from CEO’s of companies such as Chrysler and Phillip Morris telling them how much they loved this product (Post-it notes) and asking how they could get more. This was a major market pull factor as 3M now realized that this advancement in technology would satisfy a specific market need. Fry encountered serious technical problems very early. First, there was the problem of getting the adhesive to stay in place on the note instead of transferring to other surfaces. The company didn’t have coating equipment that could be precise on an imprecise backing such as paper. This resulted in further technology push as advances in the technical performance of 3M allowed for the post-it notes adhesive to be perfected as well as a manufacturing process was developed. Fry made sure that secretaries of 3M senior executives got them. Before long, their bosses were borrowing the little yellow pads. This Market pull factor illustrated the need for this innovation in the business place. In 1978 samples of numerous post-it was given out in the city of Boise. 3M discovered that more than 90 percent of the people who tried them would buy them. This market pull factor showed the general market need for this product. After success in Boise, 3M was convinced that the market potential for the yellow note was enormous and, in 1980, post-it notes were introduced nationally. The Managerial Implications * Technical and Market considerations * How to sustain new innovations * Time consumption * How to protect innovation from competitors. Recommendations Managers must take into account during problem solving within a firm, the technical and market factors in order to achieve successful management of technology. * Managers must invest time and money in research and development and other efforts to not only make improvements to commercialized technologies but to continuously endeavor to come out with new technologies/innovations. * Managers must respond to time consumption and sho rten the time it takes them to design, develop and put new innovations on the market. They must decide when to innovate, update, or replace previous technology . They must also develop methods to cope with shorter product life cycles. This can be done through continuous improvement. * Managers must protect new innovations from competitors through the use of patents, trademarks, copyrights, and designs. This will also result in higher profitability for the organization. Conclusion The development of post-it notes was driven both by technological push and market pull factors. These factors resulted in; the recognition of a potential problem, decision of which technologies to use, a feasible solution to the problem, and the final commercialization of the innovation. Managers must learn to cope with the implications that will face them. References http://www. innovation. lv/ino2/publications/leonardo_manual/en/www. innosupport. net/webhelp/wso/ind http://multimedia. 3m. com/mws/mediawebserver? 77777XxamfIVOWwo_Pw5_W7HYxTHfxajYv7HYv7H777777– ex. cfm@fuseactionlearnl_id4240pl_id3558. htm http://www. tu-harburg. de/tim/downloads/arbeitspapiere/Working_Paper_5. pdf http://en. wikipedia. org/wiki/Post-it_note http://www. 3m. com/us/about3M/innovation/archive. html A Paper on the Market Pull and Technology Push Factors I will be reporting on just one of 3M’s many innovative products the post-it notes. I will also highlight the market pull and technology push factors that were considered in developing the innovation. The key terms to be identified in this report are innovation, technology push, and market pull. Innovation refers both to the output and the process of arriving at a technically feasible solution to a problem triggered by a technological opportunity or customer need. Technology push describes a situation where an emerging technology or a new combination of existing technologies provide the driving force for an innovative product and problem solution in the market place. Market pull is the advancement of technology oriented primarily toward a specific market need. Post-it notes are pieces of stationery with a re-usable adhesive strip on the back, designed for temporarily attaching notes to documents and other surfaces. The release of post-it notes in 1980 in the United States was one that was not only innovative for its time but one which captured the needs of consumers in a whole new way. Post-it note became a big success for 3M and was adored by customers. The first and probably most important technology push that resulted in post-it notes is senior scientist Spencer Silver’s 1968 discovery of an adhesive that didn’t act like any others. Instead of forming a film, it is a clear, reusable and pressure-sensitive adhesive. For five years, Silver promoted his invention within 3M, both informally and through seminars, but without much success. In 1974 Art fry perceived the idea of coating the adhesive on paper. He soon realized that this technology would serve well as a note pad. 3M conducted a direct-mail program to the secretaries of CEOs of Fortune 100 companies, and got back letters from CEO’s of companies such as Chrysler and Phillip Morris telling them how much they loved this product (Post-it notes) and asking how they could get more. This was a major market pull factor as 3M now realized that this advancement in technology would satisfy a specific market need. Fry encountered serious technical problems very early. First, there was the problem of getting the adhesive to stay in place on the note instead of transferring to other surfaces. The company didn’t have coating equipment that could be precise on an imprecise backing such as paper. This resulted in further technology push as advances in the technical performance of 3M allowed for the post-it notes adhesive to be perfected as well as a manufacturing process was developed. Fry made sure that secretaries of 3M senior executives got them. Before long, their bosses were borrowing the little yellow pads. This Market pull factor illustrated the need for this innovation in the business place. In 1978 samples of numerous post-it was given out in the city of Boise. 3M discovered that more than 90 percent of the people who tried them would buy them. This market pull factor showed the general market need for this product. After success in Boise, 3M was convinced that the market potential for the yellow note was enormous and, in 1980, post-it notes were introduced nationally. The Managerial Implications * Technical and Market considerations * How to sustain new innovations * Time consumption * How to protect innovation from competitors. Recommendations Managers must take into account during problem solving within a firm, the technical and market factors in order to achieve successful management of technology. * Managers must invest time and money in research and development and other efforts to not only make improvements to commercialized technologies but to continuously endeavor to come out with new technologies/innovations. * Managers must respond to time consumption and sho rten the time it takes them to design, develop and put new innovations on the market. They must decide when to innovate, update, or replace previous technology . They must also develop methods to cope with shorter product life cycles. This can be done through continuous improvement. * Managers must protect new innovations from competitors through the use of patents, trademarks, copyrights, and designs. This will also result in higher profitability for the organization. Conclusion The development of post-it notes was driven both by technological push and market pull factors. These factors resulted in; the recognition of a potential problem, decision of which technologies to use, a feasible solution to the problem, and the final commercialization of the innovation. Managers must learn to cope with the implications that will face them. References http://www. innovation. lv/ino2/publications/leonardo_manual/en/www. innosupport. net/webhelp/wso/ind http://multimedia. 3m. com/mws/mediawebserver? 77777XxamfIVOWwo_Pw5_W7HYxTHfxajYv7HYv7H777777– ex. cfm@fuseactionlearnl_id4240pl_id3558. htm http://www. tu-harburg. de/tim/downloads/arbeitspapiere/Working_Paper_5. pdf http://en. wikipedia. org/wiki/Post-it_note http://www. 3m. com/us/about3M/innovation/archive. html

Tree in a field Essay Example | Topics and Well Written Essays - 1250 words

Tree in a field - Essay Example At the age of 15, Walter Kuhn sold the first drawing to a certain magazine; it is at this point that he began to sign his name as Walt. He would later enroll for evening art classes at Brooklyn Polytechnic Institute in 1893. Later, Kuhn lost interest on becoming artist and instead chose to sell bicycles in a shop at Brooklyn. He had a very dedicative personality and yet he would also be regarded as impulsive. By 1899, Kuhn was overwhelmed with the ideas from the American West. Though he only $60, he decided to move to California. In San Francisco, Kuhn began to draw cartoons to WASP magazine. He later moved to Paris in 1901and then enrolled in the formal class of the Academy Colarossi. He never got much exited with the learning and chose to move to Munich where he got opportunity to study under Barbizon Painter Heinrich von Zugel After 2 years, Kuhn returned to New York and found himself immersed in the booming art scene in New York. He helped manage the Kit Kat Club while at the same time he continued to work as an illustrator for local journals. The Kit Club was an organization which had a responsibility of raising funds for the scholarship at the Academy of Design. Kuhn staged his first exhibition in 1905 at Salmagundi Club, presenting himself both as a serious painter and a cartoonist. In the same year, Kuhn submitted his first illustration of the LIFE magazine. (Meally, Robert G., and Romare Bearden, 19) Kuhn in most of his time spent his summer in Fort Lee in New Jersey. This area provided him with a good environment for creativity which he needed to thrive in the industry. Kuhn would later join the New York School of art when they moved to the area as a member of the faculty. He later moved to New York where he got married to Vera Spier. They got one child Brenda Kuhn. At the point when his home life blossomed, his career too became better and better. In 1909, he spent the

The Movie Crash Essay Example | Topics and Well Written Essays - 1000 words

The Movie Crash - Essay Example The movie avoids conversations leading to the topic on racism the author and journalist Jeff Chang tends to feature the practice as an â€Å"abomination to Hollywood subsequent to 9/11.†When an individual watch the movie for the first time; elements of race and prejudice appears evidently present. In as much as, the movie constantly talks about the issue of shoving racism, it ends up contradicting the message as the movie constantly voices, the advantages and superiority; that the whites enjoys in the film (Haggis et al, 24). The whites in the movie crash tend to enjoy superior positions, both in social class and economic settings. White characters such as; Jean and Rick Cabot, acted by Sandra Bullock with Brendan Fraser correspondingly, appear as prominent individuals in L.A socialites; characters like Rick, works as the District Attorney of Los Angeles (Haggis et al, 124). The society in the film comprises wealthy black producers like Cameron Thayer (Terence Howard), who des pite their wealthy status, experiences social insecurity. Tony Danza, a television chief producer, another white character tells Thayer, who appears black; to ensure that one of his actors brings out a â€Å"more black† personality as the character must appear â€Å"as the dumb one.† Characters like John Ryan, who appears to be played by Matt Dillion, and Tom Hasan Played by Ryan Phillippe appear as police detectives in the Los Angeles Police Department. The film clearly depicts that no white character that is seen struggling with financial discomforts. At this juncture, most of the alternative characters appear as impoverished or defenseless socially in the society (Haggis et al, 110). Michael Pena’s, acts as Daniel, a young Hispanic, family man, who has a young daughter appears as a working class. The daughter appears to sleep under the bed, on hearing the gun shots, the audience, which scared her. Her fears come the incident when a bullet penetrated into her room, in their former old house they had just vacated; Daniel later comments saying that the area’s neighborhood appeared as insecure (Haggis et al, 124). He operates for a 24-hour locksmith who leaves for a call at jean and Rick Cabot’s residence; he bumps into two youthful Black car thieves named Antony (Ludacris) and peter (Latez Tate). Jean demands the change of the locks as she believes that Daniel might give the key to his supposed friends, appearing as members of the gang. Daniel overhears the statement that Jean made as he was in the down Hall way. Daniel is also seen fixing Farhad’s convenience store’s back door. Daniel tells the store owner that the door requires replacement; the idea appears to disturb Farhad, the older Persian man, engages in business, misinterprets Daniel’s quest. Daniel and Fahad end up shouting at each other; at this juncture, Fahad terms Daniel as a fraudulent man (Haggis et al, 111). There exists another Officer na med Ryan; Ryan’s encounters a situation where he must contend with racism. The racism originates from Ryan father’s retrogress in life. Ryan appears underprivileged, in a way that he struggles to get the basic items including food and shelter. These appears as movie demonstration, despite the fact that, they appear slightly exaggerated, displaying how the wealthy individuals resides in the States (Haggis et al, 122). Contrary, the whites enjoy a distinct group comprising of Americans

Conduct an external environment analysis for a company of your choice Essay

Conduct an external environment analysis for a company of your choice assessing the impact of the external environment on Human - Essay Example The main objective of external analysis is to identify the opportunities and threats in the environment. Identifying and exploiting the opportunities and minimizing the threats, which are hindering performance can help the organization achieve its strategic competitiveness (Hitt, et al, 2009). This external environment has its impact on business strategy and hence on the human resource strategy as well. This paper aims at conducting the external environment analysis of Toyota and studies its impact on the human resource policies and practices of the organization. This paper will make use of different matrices, methods and tools to conduct the industry analysis. Automobile manufacturing is a very significant industry which contributes to 10% of the world GDP. Globalization has resulted in increased pressure on the firms to achieve global competitive advantage. Automotive industry has recently witnessed large scale consolidation of organization resulting in mergers and acquisitions to capitalize the strengths of each market and organization. Most of the organizations in the automobile industry are doing business offshore. The automobile industry global competition is characterized by big three American and Japanese giants with the shift moving towards Japanese automakers which includes Toyota. Toyota is increasing its market share and becoming more dominant and less threatened by its competitors. An external audit of Toyota will reveal its opportunities and threats and its impact on the business and HR strategy. External Environment Analysis The external environment or the macro environment has a strong impact on the all activities and strategies of the organization. These factors include political, social, economic, legal, technological and eco-environmental factors. Two models are used to analyze the force and impact of these factors. These two models are called â€Å"PESTEL Analysis† and â€Å"Porters five forces†. An industry’s attractive ness is evaluated through Porter’s five forces model. According to the model the forces that affect an industry are the threat of entrants, threat of substitutes, bargaining power of buyers, bargaining power of suppliers and the level of rivalry among the existing competitors (Porter, 2008). The evaluation determines the attractiveness or unattractiveness of the industry and also helps in formulating strategies for obtaining competitive advantage. The attractiveness of an industry in turn determines the overall profitability of the industry measured through overall return on investment. It requires utilizing the existing industry environment to gain competitive advantage. Out of the five forces the strongest competitive force indicates the profitability of the industry and forms the most crucial part of strategy formulation. If the affect of forces is intense then the industry is said to be unattractive that is companies in the industry will not earn attractive return on thei r investments while if the forces are not intense then the industry is attractive and the companies in the

Critical Incident Paper Essay Example | Topics and Well Written Essays - 1000 words

Critical Incident Paper - Essay Example The most significant reason for a business to embrace diversity is to ensure that creativity is maintained. People from diverse cultural backgrounds usually approach problems from different perspectives. A combination of creative ideas usually leads to the realization of a practical solution (Scott 2007). However, the values and principles of each culture have to be respected in order to achieve the desired integrity in the workplace. In this particular incident, there was a misunderstanding between the management and some of the workers regarding certain cultural values whereby people are restricted from engaging in certain activities during a certain period of the year that has been set aside for fasting and remembering the problems that the society has been going through and coming up with ideas of how to tackle them, and also assist the disadvantaged people in the society. This particular incident presented a dilemma to some of the employees, who were required to participate in a send off party prepared to honour the outgoing executive director. The event involved celebrating and feasting, which was not in line with the cultural practices of the employees who were required by their culture to shun from feasting for a whole month. On the other hand, each off the employee had a role to play in the banquet organized by the management. Although the employees who were affected by their culture comprised a minority of the employee population, it was necessary for the management to recognize them. As Dana (2000) observes, ignorance, negligence and discrimination in the workplace lead to conflict. There was a general misunderstanding by the management regarding the significance of this cultural event, and the implication of preventing some of the employees from participating fully in it through engaging them in the banquet. It is important for managers in any work place

Linguistic Data Collection with Critical Commentary Essay

Linguistic Data Collection with Critical Commentary - Essay Example Center of discussion in this paper is linguistics, the study of the structure and nature of a language. Traditionally, it encompasses syntax, phonology and semantics. Synchronic study of linguistics aims at describing a language as it appears at the time. Diachronic studies describe a language in its historical development. The philosophers from Greek brought a debate on the origin of language. They were the first in the Western countries to get concern about the theory of linguistic. Thrax Dionysus wrote the first Greek grammar during the first century Before Christ. It was a roman grammar model that led to Renaissance and medieval vernacular grammars. The rise of linguistics historically in the 19th century enabled it to become a science. During early 20th and late 19th centuries, a linguistic structuralist school was set up by Ferdinand de sausure. It allowed analysis of actual speech and learning about the basis and structure of a language. Noam chosky argued in 1950s that, struc turalist program must study native speakers’ competence and not the performance. His approach to linguistic is referred to as transformational generative grammar was revised severally in the recent period to become an extended theory. It is also important to look at discourse markers since they will help in the deeper understanding of the information distinguishing between the right and false information regarding the organization. The paper will examine phonetic transcription whereby real words from the interviewee will give a clear distinction between the previous and the current perception of the Freemasonry. It helps to give clear pronunciation of words by the speaker in order to be understood better. The following lines give the aspect of discourse, 01.15 01:0049 interviewee statements. Data Collecting Techniques There are different methods of collecting data in linguistics. They include participant-observation, interviews, introspection, written data and questionnaires. In the participant-observer, the researcher must be one of the native speakers of the language to apply this method of data collecting (Kontra, 2004). The method can be applicable to this research but, it cannot allow room for acquiring all the required information. Introspection is a method of data co

Scholarships For Continuing Education Of Nurses Article

Scholarships For Continuing Education Of Nurses - Article Example To address the current nursing shortage entails considerable efforts that are directed towards the recruitment and retention of nurses along with the capabilities of nursing schools. A number of strategies have often been suggested, such as the supply of sufficient educational facilities, faculty members and funding as well as the increase of financial aid for students and nurses by means of scholarships and other forms of programs and grants (Griscti and Jacono, 2005). Such financial support has especially been found to be inadequate in helping nurses who aim to pursue continuing education. The significance of continuing education has increasingly been debated over the years, particularly in the nursing literature. It has become highly important for stakeholders and policymakers alike in the healthcare industry and has been reflected in different decrees, including the Nurse, Midwives, and Health Visitors Act of 1979 as well as recommendations presented by organizations around the w orld, such as the Canadian Nurses Association Policy Statement in Canada and the National Staff Committee for Nurses and Midwives in the United Kingdom (Griscti and Jacono, 2005). However, despite the relevance of continuing education to nurses along with the participation of different stakeholders, there has still been a considerable lack of financial aid for those who aim to pursue such form of education. ... continuing education to nurses along with the participation of different stakeholders, there has still been a considerable lack of financial aid for those who aim to pursue such form of education. The following sections will then look into nursing education and the funding associated with it, the importance of continuing education as well as the financial support made available to nurses who seek continuing education, particularly the availability of scholarship grants. Education in Nursing There has been a continual debate in the United States concerning the AD and BS education as the American Association of Colleges of Nursing (AACN, 2002) associated the past years with professional tension with regards to chosen routes towards nursing practice. Educators have supported different rewards and practices over the years. Nonetheless, these various levels of skills and competencies have not been equally recognized in the work settings, neither through role differentiation nor compensati on. Such occurrences have served as a deterrent for nurses to further raise their level of education and pursue continuing education. In addition, it has been found out that, although some hospitals based their salaries on the nurses’ educational level with which the actual financial increment was small, many other employers strongly relied on available new workers who have received their education in the US or abroad (Joint Commission on Accreditation of Healthcare Organizations (JCAHO), 2003). Majority of lawmakers in the country have provided funds for student loan forgiveness as well as loan repayment; these have been used as strategies for attracting new nursing graduates to settle in their state of graduation. Again, such efforts place more emphasis on entry-level registered nurses.

Melody in the Middle Ages Essay Example for Free

Melody in the Middle Ages Essay In the early Middle Ages, melodic or textual embellishments added to plainchant were referred to as prosulae. In your own words, summarize the types of plainchant to which prosulae were most often added and the reasons for those additions. The Book of Hymns is one prime example of a prosulae. Plainchant was being sung day in and day out by the monks, who had already added some slight melody, but was still not easy to memorize. By adding some rhythm and separation in syllables throughout the melody, a new way to not only memorize the verses, but also present them, was born. In the early Middle Ages, melodic or textual embellishments added to plainchant were referred to as prosulae. In your own words, summarize Notkers description of how and why he came to add words to melismas, and his teacher Isos response. Notker realized as a young child that he wanted to find a way to remember the words to certain melodies, but with them being so long, he could not. When he came across a man with sequenced verses he was at first excited, but soon disappointed as they did no better than the long, monotonous melodies he remembered as a child. When he decided to add words to these verses and took them to his teacher, Iso, he both appreciated and pitied Notker. He went back and corrected some mistakes pointed out by his teacher, and these changes proved to be successful. The new verses were deemed worthy and copied to a roll for the all of the boys to sing.

Communicative Language Teaching And Communicative Competence

Communicative Language Teaching And Communicative Competence Hymes pointed out that those rules are the knowledge of the rules of socio-cultural communication with others; how, what, where, when and in what aspect language is spoken in a proposed society. Therefore, according to Chomsky it can be described as the knowledge of the grammatical and speech rules of a language and the ability to use these rules in the away that does not deviate from the native-speakers style to use the language. Hymes, however declared that this definition is not appropriate and, instead, he suggested that effective performance is not the result of linguistic competence given by Chomsky, but by knowledge of the rules of the socio-cultural communication too, and hence communicative competence is actually what results in appropriate performance. Hymes theory took the attention of many syllabus designers to adopt on communicative competence. For instance, Canale and Swain, suggested models for classroom teaching using Hymes views. Van Ek and Alexander (1975), and Wilkins (1976) presented the Notional Syllabus. This syllabus is distinguished by its attention to functions and notions as applications of Hymes views. Curriculum writers like Widdowson (1978,1979), Munby (1978), Breen and Candlin (1980), Littlewood (1981), Brumfit and Johnson (1983), Yalden (1983) Johnson, applied Hymes views and devised communicative teaching materials based on these views (Richards and Rodgers, 2001). The CLT has been widespread based on Hymes views occurred in the 1970s. It has established as an approach in the field of language teaching, in which the four language skills (reading, listening, writing and speaking) are correlated appropriately, comprehensively and communicatively. This way of teaching defers it from the other teaching methods as for it engages the teachers and students, along with and the materials working as one component towards the use of language as one unit. Lindsay (2006: 21) points out that it could be said that the communicative method is a result of linguists satisfactory with the traditional methods as these methods put little, if any, emphasis on the ability to communicate or interact. However, Richards Rogers (1986: 50) pointed out that Communicative Language Teaching is best considered as an approach rather than a method. Also, Rogers (2001: 9- 10) made a distinction between methods and approaches: methods are teaching systems with prescribed techniques and practices, but approaches deal with language teaching philosophies that can be implemented in the classroom in different styles. Widdowson (1990: 159) explained that the communicative approach concentrates on getting learners to do things with language, to express concepts and to carry out communicative acts of various kinds. The content of a language course is now defined not in terms of forms, words and sentence patterns, but in terms of concepts, or notions, which such forms are used to express, and the communicative functions which they are used to perform. Richards Rogers (1986: 49) stated that the theory of teaching underlying the Communicative Approach is holistic rather than behaviouristic. It starts from a theory of language as communication, which implies knowledge of the grammatical system as well as performance. Also, Aqel (2006) pointed out that the aim of this Communicative approach is to prepare students for meaningful communication, where errors are tolerated. The amount of exercises and activities involved with a communicative approach is not restricted and connected with the constructivist theory of learning. George (1999: 16-17) pointed out that Constructivism is basically a theory based on observation and scientific study about how people learn. It says that people construct their own understanding and knowledge of the world, through experiencing things and reflecting on those experiences. This means that the students effectively create their own subjective representations of objective reality. In addition, the teacher in communicative approach is not the centre of all classroom activities as the focus is mainly directed towards the learners (p. 22). Lantolf (2000) called the communicative methodology and constructivist theory of learning activity theories. It means that teachers and students have to interact and reconstruct socially with ideas and knowledge. (pp. 12-13). 2.2 Communicative Language Teaching (CLT) Communicative Competence (CC) The difference between CLT and traditional teaching methods, like the grammar translation method (GTM) and the audio- lingual method (ALM), is that the CLT approach mainly focuses in teaching and learning a language. The basic goals of teaching using the CLT approach is not rather its structure but communicative function (Littlewood, 1981; 1998). That is, the main goal of teaching and learning a language is to improve students communicative competence (Li, 1998). Thus, theoretically, it is useful to understand and introduce what is communicative competence, before understanding CLT. 2.2.1 Communicative Competence: In the 1970s, many researchers distinguished between linguistic and communicative competence (Hymes, 1967; Paulston, 1974) to point out the difference between the knowledge of the language forms and knowledge that help learners communicate functionally and interactionally. According to Savignon (1997: 272) Communicative Competence is: functional language proficiency; the expression, interpretation, and negotiation of meaning involving interaction between two or more persons belonging to the same (or different) speech community. In addition, Savignon divided communicative competence as having the following elements; 1) communicative competence is a dynamic, but not a static concept. It depends on the negotiation of meaning between two or more learners who share to some extent the same symbolic system; 2) communicative competence involved in both written and spoken language, as well as to many other symbolic systems; 3) communicative competence is context specific. Communication takes place in an infinite variety of situations, and success in a particular role depends on ones knowledge of the context; 4) competence and performance defers theoretically. Competence is defined as a presumed underlying ability whereas performance as the overt manifestation of that ability. Competence is what one knows. Performance is what one does and 5) communicative competence is relative, not absolute, and depends on the cooperation of all the participants (p. 14-15). Savignon has worked on communicative competence, and her work is known and considered in the field. However, Canale and Swain (1980) presented the four- area framework of knowledge and skill regarding communicative competence. They declared that communicative competence involves grammatical competence, sociolinguistic competence, discourse competence, and strategic competence. Then Canale (1983: 7) pointed that grammatical competence focuses directly on the knowledge and skill required to understand and express accurately the literal meaning of utterances. Sociolinguistic competence refers to the learners ability to use the language appropriately in social contexts. Therefore sociolinguistic competence shows the learners ability to go beyond the literal meaning of utterances and recognize what is the intent of such utterances in particular social situations. In addition, Canale (1983: 8) says that sociolinguistic competence is important in explaining utterances for their social meaning. It is important to acknowledge that communicative competence is a major aspect of CLT, and teachers are said to understand its many aspects. 2.2.2 Communicative Language Teaching: Researchers and linguistics have focused on the shift from the language to communication. Brumfit (1988) referred to communication as a task to be performed,

Profiling Essay -- Legal Issues, Ethics

One area of psychology and investigation, (an occupation? or shall I say craft?), many ways to refer and interpret it, with a complex past intermingling various areas of study, Profiling, like any other area of study, has both its advantages and disadvantages. Yet, how useful is it as an investigative tool? It certainly isn’t considered as a hard science, however this does not mean that is should be discarded and not taken seriously. Or does it? I say advantages and disadvantages, because whilst my personal position is towards profiling in general, it can only be used in conjunction with other, more deeply studied police work. Here I will discuss mainly its advantages and why I hold the position in favor of criminal profiling, but some disadvantages will obviously be mention in relation the advantages. As asserted by Wilson and Seaman (2007), one of the first psychological profilers was James A. Brussel, M.D in the 1950, then dubbed â€Å"The Sherlock Holmes of the Couch.† Although he was very accurate in providing the police with a profile of the criminal which helped them locate and arrest the Mad Bomber, using primarily his handwriting on letters sent to the police, his â€Å"technique was not enough in itself to change traditional law enforcement procedures.† (Wilson and Seaman, 2007). It was only in the early 1970s that the FBI Behavioral Science Unit in Quantico decided to use this profiling technique when investigating violent crimes. Here, they would profile the type of criminal involved using the crime scene itself and the various criminal MOs. Their initial investigation using this method was held in 1974 with the case of the kidnapped seven-year old girl, Susan Jaeger. Profilers predicted the kidnapper being a young, whi... ...nalytical Theory. Turvey (2001) points of the voyeurism problem and affirms that this fact alone might be a magnet for so-called profilers to join the field. This, of course, will create problems for all involved in the case. Here, another setback to profiling is formed which might reduce the profiler’s ‘expertise’, for how can on be certain of the real intention of a profiler and his compatibility to the team? Having said all this, one can say that in reality, profiling is an art and not a science, as â€Å"by itself, a profile does not solve any crime† (Holmes and Holmes, 2009). That is, however, not said to reduce all its credibility and usefulness. Profilers have helped the police and it most likely that will continue to do so in the future, but it must be kept strictly as an aid and not as the only means. But yes, all in all, it is a useful investigative tool.

Extermination Camps Essay -- essays research papers

Nazi Extermination Camps Anti-Semitism reached to extreme levels beginning in 1939, when Polish Jews were regularly rounded up and shot by members of the SS. Though some of these SS men saw the arbitrary killing of Jews as a sport, many had to be lubricated with large quantities of alcohol before committing these atrocious acts. Mental trauma was not uncommon amongst those men who were ordered to murder Jews. The establishment of extermination camps therefore became the â€Å"Final Solution† to the â€Å"Jewish Question†, as well as a way to alleviate the mental trauma that grappled the minds of Nazi soldiers. The following essay will examine various primary and secondary sources to better illuminate the creation, evolution, practices and perpetrators of the extermination camps wherein the horrors of the Holocaust were conducted.   Ã‚  Ã‚  Ã‚  Ã‚  Pridham Noakes maintains that the creation of extermination camps began for two important reasons, the first already being mentioned as a way of soothing the psychological stress imposed upon Nazi soldiers of the Einsatzgruppen ordered to kill Jews with firearms. Fischer discusses the mental consequences which overcame soldiers of the Einsatzgruppen as a result of these brutal murders: â€Å"The men†¦were physically and psychologically drained. Some sought refuge in alcohol, some became physically ill, a few committed suicide.† The second reason for the creation of the extermination camps was to better conceal â€Å"subhuman† extermination from public (and foreign) view while accelerating the process of mass genocide.   Ã‚  Ã‚  Ã‚  Ã‚  The first extermination camp was located in Chelmno, Poland, where gas vans were used to kill the camps’ victims. Gas vans had been introduced in Poland in 1939, Noakes maintains, and had initially been used to murder Russian POWs. The gassing of Polish Jews began in 1941 after the Nazis had forcefully gathered the majority of them into ghettoes around Lodz and Warthegau. The process was of crude design: Jews (and other ‘subhuman’ subjects) were rounded up and told they were to be sent to a labor camp. Before this, however, they were to strip naked and bathe. After stripping, the victims were herded and locked into a gas van. The ‘driver’ started the engine, and the exhaust from the vehicle flooded into the van, killing the victims inside. According to Noakes, â€Å"a recent estima... ... personality structure. Eichmann, Himmler, Hess and Mengele were true believers with all the strength and intensity that accompanies the will to believe. A strong will to believe combined with a stubborn, inflexible personality type is then, according to Fischer what drove these men to commit the atrocities of the Holocaust. All these men needed was to be given something to believe strongly about, and Hitler gave it to them. I find this argument plausible, yet leaning toward generalization. Were the mentalities of Himmler and Eichmann that comparable? I think a far more detailed look at their personalities might prove otherwise. Nevertheless, both indeed carried out the orders of one of the most tyrannical governments to come to power during the 20th Century. An exact estimate of how many Jews were killed during the Holocaust has never been calculated, and figures range anywhere from four to seven million. Noakes asserts that the most reliable source comes from Eichmann himself, whose estimate was voiced through one of his subordinates (Wilhelm Hoettl of the RSHA) and calculated at roughly 6 million. Out of these 6 million, four milli on were killed in the extermination camps. Extermination Camps Essay -- essays research papers Nazi Extermination Camps Anti-Semitism reached to extreme levels beginning in 1939, when Polish Jews were regularly rounded up and shot by members of the SS. Though some of these SS men saw the arbitrary killing of Jews as a sport, many had to be lubricated with large quantities of alcohol before committing these atrocious acts. Mental trauma was not uncommon amongst those men who were ordered to murder Jews. The establishment of extermination camps therefore became the â€Å"Final Solution† to the â€Å"Jewish Question†, as well as a way to alleviate the mental trauma that grappled the minds of Nazi soldiers. The following essay will examine various primary and secondary sources to better illuminate the creation, evolution, practices and perpetrators of the extermination camps wherein the horrors of the Holocaust were conducted.   Ã‚  Ã‚  Ã‚  Ã‚  Pridham Noakes maintains that the creation of extermination camps began for two important reasons, the first already being mentioned as a way of soothing the psychological stress imposed upon Nazi soldiers of the Einsatzgruppen ordered to kill Jews with firearms. Fischer discusses the mental consequences which overcame soldiers of the Einsatzgruppen as a result of these brutal murders: â€Å"The men†¦were physically and psychologically drained. Some sought refuge in alcohol, some became physically ill, a few committed suicide.† The second reason for the creation of the extermination camps was to better conceal â€Å"subhuman† extermination from public (and foreign) view while accelerating the process of mass genocide.   Ã‚  Ã‚  Ã‚  Ã‚  The first extermination camp was located in Chelmno, Poland, where gas vans were used to kill the camps’ victims. Gas vans had been introduced in Poland in 1939, Noakes maintains, and had initially been used to murder Russian POWs. The gassing of Polish Jews began in 1941 after the Nazis had forcefully gathered the majority of them into ghettoes around Lodz and Warthegau. The process was of crude design: Jews (and other ‘subhuman’ subjects) were rounded up and told they were to be sent to a labor camp. Before this, however, they were to strip naked and bathe. After stripping, the victims were herded and locked into a gas van. The ‘driver’ started the engine, and the exhaust from the vehicle flooded into the van, killing the victims inside. According to Noakes, â€Å"a recent estima... ... personality structure. Eichmann, Himmler, Hess and Mengele were true believers with all the strength and intensity that accompanies the will to believe. A strong will to believe combined with a stubborn, inflexible personality type is then, according to Fischer what drove these men to commit the atrocities of the Holocaust. All these men needed was to be given something to believe strongly about, and Hitler gave it to them. I find this argument plausible, yet leaning toward generalization. Were the mentalities of Himmler and Eichmann that comparable? I think a far more detailed look at their personalities might prove otherwise. Nevertheless, both indeed carried out the orders of one of the most tyrannical governments to come to power during the 20th Century. An exact estimate of how many Jews were killed during the Holocaust has never been calculated, and figures range anywhere from four to seven million. Noakes asserts that the most reliable source comes from Eichmann himself, whose estimate was voiced through one of his subordinates (Wilhelm Hoettl of the RSHA) and calculated at roughly 6 million. Out of these 6 million, four milli on were killed in the extermination camps.

car accident :: essays research papers

Traumatic events come in many different ways at many different times of ones life. Mine came on the school bus while I was on my way home from school. The bus had stopped to let a couple kids off and I stood up to throw some trash away. I stood up we were rear ended by a young lady who had been trying to get a bee out of the car and not realized the bus had stopped. I was standing up and the impact caused me to bang into the seat in front of me and the one behind me. I didn’t realize what had happened until moments later when someone said something. As I began to sit down I felt a sharp pain shoot through my body and my heart started to beat rapidly.   Ã‚  Ã‚  Ã‚  Ã‚  The accident made me realize that nothing is for certain and you shouldn’t take anything for granted. I had always viewed riding a school bus has something that wouldn’t put me in danger, after all the drivers are trained professionals, right? What I never considered was the actions of others and how complete strangers can change your life in a bigger and more significant way than some of the people closes to you. I had never really considered dying at a young age because my grandparents lived to be old. After that bus ride home my outlook on life was severely changed and I started to appreciate my parents more an tell them I loved them a lot more often because wasn’t sure if we’d both be around to say it the next time.   Ã‚  Ã‚  Ã‚  Ã‚  The car accident will always be a major moment in my life because of what it showed me. That accident gave me visual proof that God has a plan for everyone and everything has a reason or hidden message. Just when I was coming to a point in my life where I was beginning to see where I fit in at school, it reminded me to cherish every moment has though it was my last, because I don’t know when it’ll be over.

Ncert Physics Book

Presents NCERT Text Books NCERT Text Books: 11th Class Physics About Us: Prep4Civils, website is a part of Sukratu Innovations, a start up by IITians. The main theme of the company is to develop new web services which will help people. P rep4Civils is an online social networking platform intended for the welfare of people who are preparing for Civil services examinations. The whole website was built on open-source platform WordPress. Contact Details: Website: http://www. prep4civils. com/ Email: [email  protected] comDisclaimer and Terms of Use: By following Creative Common License, for the welfare of large student body we are merging all the PDF files provided by NCERT website and redistributing the files by giving proper credit to NCERT website and the redistribution is based on the norms of Creative Common License. We are not commercially distributing the files. People who are downloading these files should not be engaged in any sort of sales or commercial distribution of these files. They can redistribute these copies freely by giving proper credit to the original author, NCERT (http://www. ncert. nic. in/NCERTS/textbook/textbook. tm) and â€Å"Prep4Civils† (http://www. prep4civils. com/) by providing proper hyperlinks of the websites. Any sort of cliches can be addressed at [email  protected] com and proper action will be taken. CONTENTS FOREWORD PREFACE A NOTE FOR THE TEACHER CHAPTER iii v x 1 PHYSICAL WORLD 1. 1 1. 2 1. 3 1. 4 1. 5 What is physics ? Scope and excitement of physics Physics, technology and society Fundamental forces in nature Nature of physical laws CHAPTER 1 2 5 6 10 2 UNITS AND MEASUREMENTS 2. 1 2. 2 2. 3 2. 4 2. 5 2. 6 2. 7 2. 8 2. 9 2. 10 Introduction The international system of units Measurement of length Measurement of massMeasurement of time Accuracy, precision of instruments and errors in measurement Significant figures Dimensions of physical quantities Dimensional formulae and dimensional equations Dimensional analysis and its applications CHAPTER 16 16 18 21 22 22 27 31 31 32 3 MOTION IN A STRAIGHT LINE 3. 1 3. 2 3. 3 3. 4 3. 5 3. 6 3. 7 Introduction Position, path length and displacement Average velocity and average speed Instantaneous velocity and speed Acceleration Kinematic equations for uniformly accelerated motion Relative velocity CHAPTER 39 39 42 43 45 47 51 4 MOTION IN A PLANE 4. 1 4. 2 4. 3 4. 4 4. 5 IntroductionScalars and vectors Multiplication of vectors by real numbers Addition and subtraction of vectors – graphical method Resolution of vectors 65 65 67 67 69 CK xii 4. 6 4. 7 4. 8 4. 9 4. 10 4. 11 Vector addition – analytical method Motion in a plane Motion in a plane with constant acceleration Relative velocity in two dimensions Projectile motion Uniform circular motion CHAPTER 71 72 75 76 77 79 5 LAWS OF MOTION 5. 1 5. 2 5. 3 5. 4 5. 5 5. 6 5. 7 5. 8 5. 9 5. 10 5. 11 Introduction Aristotle’s fallacy The law of inertia Newton’s first law of motion Newton ’s second law of motion Newton’s third law of motion Conservation of momentumEquilibrium of a particle Common forces in mechanics Circular motion Solving problems in mechanics CHAPTER 89 90 90 91 93 96 98 99 100 104 105 6 WORK, ENERGY AND POWER 6. 1 6. 2 6. 3 6. 4 6. 5 6. 6 6. 7 6. 8 6. 9 6. 10 6. 11 6. 12 Introduction Notions of work and kinetic energy : The work-energy theorem Work Kinetic energy Work done by a variable force The work-energy theorem for a variable force The concept of potential energy The conservation of mechanical energy The potential energy of a spring Various forms of energy : the law of conservation of energy Power Collisions CHAPTER 114 116 116 117 118 119 120 121 123 126 28 129 7 SYSTEM OF PARTICLES AND ROTATIONAL MOTION 7. 1 7. 2 7. 3 7. 4 7. 5 7. 6 7. 7 7. 8 7. 9 7. 10 Introduction Centre of mass Motion of centre of mass Linear momentum of a system of particles Vector product of two vectors Angular velocity and its relation with linear veloci ty Torque and angular momentum Equilibrium of a rigid body Moment of inertia Theorems of perpendicular and parallel axes 141 144 148 149 150 152 154 158 163 164 CK xiii 7. 11 7. 12 7. 13 7. 14 Kinematics of rotational motion about a fixed axis Dynamics of rotational motion about a fixed axis Angular momentum in case of rotations about a fixed axisRolling motion CHAPTER 167 169 171 173 8 GRAVITATION 8. 1 8. 2 8. 3 8. 4 8. 5 8. 6 8. 7 8. 8 8. 9 8. 10 8. 11 8. 12 Introduction Kepler’s laws Universal law of gravitation The gravitational constant Acceleration due to gravity of the earth Acceleration due to gravity below and above the surface of earth Gravitational potential energy Escape speed Earth satellite Energy of an orbiting satellite Geostationary and polar satellites Weightlessness 183 184 185 189 189 190 191 193 194 195 196 197 APPENDICES 203 ANSWERS 219 CK CK CONTENTS FOREWORD PREFACE A NOTE FOR THE TEACHERS CHAPTER iii vii x 9 MECHANICAL PROPERTIES OF SOLIDS 9. 9. 2 9. 3 9. 4 9. 5 9. 6 9. 7 Introduction Elastic behaviour of solids Stress and strain Hooke’s law Stress-strain curve Elastic moduli Applications of elastic behaviour of materials CHAPTER 231 232 232 234 234 235 240 10 MECHANICAL PROPERTIES OF FLUIDS 10. 1 10. 2 10. 3 10. 4 10. 5 10. 6 10. 7 Introduction Pressure Streamline flow Bernoulli’s principle Viscosity Reynolds number Surface tension CHAPTER 246 246 253 254 258 260 261 11 THERMAL PROPERTIES OF MATTER 11. 1 11. 2 11. 3 11. 4 11. 5 11. 6 11. 7 11. 8 11. 9 11. 10 Introduction Temperature and heat Measurement of temperature Ideal-gas equation and absolute temperatureThermal expansion Specific heat capacity Calorimetry Change of state Heat transfer Newton’s law of cooling CHAPTER 274 274 275 275 276 280 281 282 286 290 12 THERMODYNAMICS 12. 1 12. 2 Introduction Thermal equilibrium 298 299 CK CK xii 12. 3 12. 4 12. 5 12. 6 12. 7 12. 8 12. 9 12. 10 12. 11 12. 12 12. 13 Zeroth law of thermodynamics Heat, internal ene rgy and work First law of thermodynamics Specific heat capacity Thermodynamic state variables and equation of state Thermodynamic processes Heat engines Refrigerators and heat pumps Second law of thermodynamics Reversible and irreversible processes Carnot engine CHAPTER 300 300 302 03 304 305 308 308 309 310 311 13 KINETIC THEORY 13. 1 13. 2 13. 3 13. 4 13. 5 13. 6 13. 7 Introduction Molecular nature of matter Behaviour of gases Kinetic theory of an ideal gas Law of equipartition of energy Specific heat capacity Mean free path CHAPTER 318 318 320 323 327 328 330 14 OSCILLATIONS 14. 1 14. 2 14. 3 14. 4 14. 5 14. 6 14. 7 14. 8 14. 9 14. 10 Introduction Periodic and oscilatory motions Simple harmonic motion Simple harmonic motion and uniform circular motion Velocity and acceleration in simple harmonic motion Force law for simple harmonic motion Energy in simple harmonic motion Some systems executing SHMDamped simple harmonic motion Forced oscillations and resonance CHAPTER 336 337 339 341 343 345 346 347 351 353 15 WAVES 15. 1 15. 2 15. 3 15. 4 15. 5 15. 6 Introduction Transverse and longitudinal waves Displacement relation in a progressive wave The speed of a travelling wave The principle of superposition of waves Reflection of waves 363 365 367 369 373 374 CK CK xiii 15. 7 15. 8 Beats Doppler effect 379 381 ANSWERS 391 BIBLIOGRAPHY 401 INDEX 403 CK CHAPTER ONE PHYSICAL WORLD 1. 1 WHAT IS PHYSICS ? 1. 1 What is physics ? 1. 2 Scope and excitement of physics 1. 3 Physics, technology and society 1. 4 Fundamental forces in nature 1. Nature of physical laws Summary Exercises Humans have always been curious about the world around them. The night sky with its bright celestial objects has fascinated humans since time immemorial. The regular repetitions of the day and night, the annual cycle of seasons, the eclipses, the tides, the volcanoes, the rainbow have always been a source of wonder. The world has an astonishing variety of materials and a bewildering diversity of life and behaviour. The inquiring and imaginative human mind has responded to the wonder and awe of nature in different ways. One kind of response from the earliest times has been to observe the hysical environment carefully, look for any meaningful patterns and relations in natural phenomena, and build and use new tools to interact with nature. This human endeavour led, in course of time, to modern science and technology. The word Science originates from the Latin verb Scientia meaning ‘to know’. The Sanskrit word Vijnan and the Arabic word Ilm c onvey similar meaning, namely ‘knowledge’. Science, in a broad sense, is as old as human species. The early civilisations of Egypt, India, China, Greece, Mesopotamia and many others made vital contributions to its progress. From the sixteenth century onwards, great strides were made n science in Europe. By the middle of the twentieth century, science had become a truly international enterprise, with many cultures and countries contributing to its rapid growth. What is Science and what is the so-called Scientific Method ? Science is a systematic attempt to understand natural phenomena in as much detail and depth as possible, and use the knowledge so gained to predict, modify and control phenomena. Science is exploring, experimenting and predicting from what we see around us. The curiosity to learn about the world, unravelling the secrets of nature is the first step towards the discovery of science.The scientific method involves several interconnected steps : Systematic observations, controlled experiments, qualitative and 2 quantitative reasoning, mathematical modelling, prediction and verification or falsification of theories. Speculation and conjecture also have a place in science; but ultimately, a scientific theory, to be acceptable, must be verified by relevant observations or experiments. There is much philosophical debate about the nature and method of science that we need not discuss here. The interplay of theory and observation (or experiment) is basic to the progress of science. Science is ever dynamic.There is no ‘final’ theory in science and no unquestioned authority among scientists. As observations improve in detail and precision or experiments yield new results, theories must account for them, if necessary, by introducing modifications. Sometimes the modifications may not be drastic and may lie within the framework of existing theory. For example, when Johannes Kepler (1571-1630) examined the extensive data on planetary motion collected by Tycho Brahe (1546-1601), the planetary circular orbits in heliocentric theory (sun at the centre of the solar system) imagined by Nicolas Copernicus (1473–1543) had to be replaced by elliptical rbits to fit the data better. Occasionally, however, the existing theory is simply unable to explain new observations. This causes a major upheaval in science. In the beginning of the twentieth century, it wa s realised that Newtonian mechanics, till then a very successful theory, could not explain some of the most basic features of atomic phenomena. Similarly, the then accepted wave picture of light failed to explain the photoelectric effect properly. This led to the development of a radically new theory (Quantum Mechanics) to deal with atomic and molecular phenomena. Just as a new experiment may suggest an lternative theoretical model, a theoretical advance may suggest what to look for in some experiments. The result of experiment of scattering of alpha particles by gold foil, in 1911 by Ernest Rutherford (1871–1937) established the nuclear model of the atom, which then became the basis of the quantum theory of hydrogen atom given in 1913 by Niels Bohr (1885–1962). On the other hand, the concept of antiparticle was first introduced theoretically by Paul Dirac (1902–1984) in 1930 and confirmed two years later by the experimental discovery of positron (antielectron) by Carl Anderson. P HYSICS Physics is a basic discipline in the category f Natural Sciences, which also includes other disciplines like Chemistry and Biology. The word Physics comes from a Greek word meaning nature. Its Sanskrit equivalent is Bhautiki that is used to refer to the study of the physical world. A precise definition of this discipline is neither possible nor necessary. We can broadly describe physics as a study of the basic laws of nature and their manifestation in different natural phenomena. The scope of physics is described briefly in the next section. Here we remark on two principal thrusts in physics : unification and reduction. In Physics, we attempt to explain diverse hysical phenomena in terms of a few concepts and laws. The effort is to see the physical world as manifestation of some universal laws in different domains and conditions. For example, the same law of gravitation (given by Newton) describes the fall of an apple to the ground, the motion of the moon around the earth and the motion of planets around the sun. Similarly, the basic laws of electromagnetism (Maxwell’s equations) govern all electric and magnetic phenomena. The attempts to unify fundamental forces of nature (section 1. 4) reflect this same quest for unification. A related effort is to derive the properties of a igger, more complex, system from the properties and interactions of its constituent simpler parts. This approach is called reductionism and is at the heart of physics. For example, the subject of thermodynamics, developed in the nineteenth century, deals with bulk systems in terms of macroscopic quantities such as temperature, internal energy, entropy, etc. Subsequently, the subjects of kinetic theory and statistical mechanics interpreted these quantities in terms of the properties of the molecular constituents of the bulk system. In particular, the temperature was seen to be related to the average kinetic energy of molecules of the system. . 2 SCOPE AND EXCITEMENT OF PHYSICS We can get some idea of the scope of physics by looking at its various sub-disciplines. Basically, there are two domains of interest : macroscopic and microscopic. The macroscopic domain includes phenomena at the laboratory, terrestrial and astronomical scales. The microscopic domain includes atomic, molecular and nuclear P HYSICAL WORLD phenomena*. Classical Physics deals mainly with macroscopic phenomena and includes subjects like Mechanics, Electrodynamics, Optics a nd T hermodynamics . Mechanics founded on Newton’s laws of motion and the law of gravitation is concerned with the motion (or quilibrium) of particles, rigid and deformable bodies, and general systems of particles. The propulsion of a rocket by a jet of ejecting gases, propagation of water waves or sound waves in air, the equilibrium of a bent rod under a load, etc. , are problems of mechanics. Electrodynamics deals with electric and magnetic phenomena associated with charged and magnetic bodies. Its basic laws were given by Coulomb, Oersted, Fig. 1. 1 chemical process, etc. , are problems of interest in thermodynamics. The microscopic domain of physics deals with the constitution and structure of matter at the minute scales of atoms and nuclei (and even ower scales of length) and their interaction with different probes such as electrons, photons and other elementary particles. Classical physics is inadequate to handle this domain and Quantum Theory is currently accepted as the proper framework for explaining microscopic phenomena. Overall, the edifice of physics is beautiful and imposing and you will appreciate it more as you pursue the subject. Theory and experiment go hand in hand in physics and help each other’s progress. The alpha scattering experiments of Rutherford gave the nuclear model of the atom. Ampere and Faraday, and encapsulated by Maxwell in his famous set of equations.The motion of a current-carrying conductor in a magnetic field, the respons e of a circuit to an ac voltage (signal), the working of an antenna, the propagation of radio waves in the ionosphere, etc. , are problems of electrodynamics. Optics deals with the phenomena involving light. The working of telescopes and microscopes, colours exhibited by thin films, etc. , are topics in optics. Thermodynamics, in contrast to mechanics, does not deal with the motion of bodies as a whole. Rather, it deals with systems in macroscopic equilibrium and is concerned with changes in internal energy, temperature, entropy, etc. , of the ystem through external work and transfer of heat. The efficiency of heat engines and refrigerators, the direction of a physical or * 3 You can now see that the scope of physics is truly vast. It covers a tremendous range of magnitude of physical quantities like length, mass, time, energy, etc. At one end, it studies phenomena at the very small scale of length -14 (10 m or even less) involving electrons, protons, etc. ; at the other end, it dea ls with astronomical phenomena at the scale of galaxies or even the entire universe whose extent is of the order of 26 10 m. The two length scales differ by a factor of 40 10 or even more.The range of time scales can be obtained by dividing the length scales by the –22 speed of light : 10 s to 1018 s. The range of masses goes from, say, 10–30 kg (mass of an 55 electron) to 10 kg (mass of known observable universe). Terrestrial phenomena lie somewhere in the middle of this range. Recently, the domain intermediate between the macroscopic and the microscopic (the so-called mesoscopic physics), dealing with a few tens or hundreds of atoms, has emerged as an exciting field of research. 4 Physics is exciting in many ways. To some people the excitement comes from the elegance and universality of its basic theories, from the fact that few basic concepts and laws can explain phenomena covering a large range of magnitude of physical quantities. To some others, the challenge in c arrying out imaginative new experiments to unlock the secrets of nature, to verify or refute theories, is thrilling. Applied physics is equally demanding. Application and exploitation of physical laws to make useful devices is the most interesting and exciting part and requires great ingenuity and persistence of effort. What lies behind the phenomenal progress of physics in the last few centuries? Great progress usually accompanies changes in our basic perceptions.First, it was realised that for scientific progress, only qualitative thinking, though no doubt important, is not enough. Quantitative measurement is central to the growth of science, especially physics, because the laws of nature happen to be expressible in precise mathematical equations. The second most important insight was that the basic laws of physics are universal — the same laws apply in widely different contexts. Lastly, the strategy of approximation turned out to be very successful. Most observed phenomena in daily life are rather complicated manifestations of the basic laws. Scientists recognised the importance f extracting the essential features of a phenomenon from its less significant aspects. It is not practical to take into account all the complexities of a phenomenon in one go. A good strategy is to focus first on the essential features, discover the basic principles and then introduce corrections to build a more refined theory of the phenomenon. For example, a stone and a feather dropped from the same height do not reach the ground at the same time. The reason is that the essential aspect of the phenomenon, namely free fall under gravity, is complicated by the presence of air resistance. To get the law of free all under gravity, it is better to create a situation wherein the air resistance is negligible. We can, for example, let the stone and the feather fall through a long evacuated tube. In that case, the two objects will fall almost at the same rate, giving the basic law t hat acceleration due to gravity is independent of the mass of the object. With the basic law thus found, we can go back to the feather, introduce corrections due to air resistance, modify the existing theory and try to build a more realistic P HYSICS Hypothesis, axioms and models One should not think that everything can be proved with physics and mathematics.All physics, and also mathematics, is based on assumptions, each of which is variously called a hypothesis or axiom or postulate, etc. For example, the universal law of gravitation proposed by Newton is an assumption or hypothesis, which he proposed out of his ingenuity. Before him, there were several observations, experiments and data, on the motion of planets around the sun, motion of the moon around the earth, pendulums, bodies falling towards the earth etc. Each of these required a separate explanation, which was more or less qualitative. What the universal law of gravitation says is that, if we assume that any two odies in the universe attract each other with a force proportional to the product of their masses and inversely proportional to the square of the distance between them, then we can explain all these observations in one stroke. It not only explains these phenomena, it also allows us to predict the results of future experiments. A hypothesis is a supposition without assuming that it is true. It would not be fair to ask anybody to prove the universal law of gravitation, because it cannot be proved. It can be verified and substantiated by experiments and observations. An axiom is a self-evident truth while a model s a theory proposed to explain observed phenomena. But you need not worry at this stage about the nuances in using these words. For example, next year you will learn about Bohr’s model of hydrogen atom, in which Bohr assumed that an electron in the hydrogen atom follows certain rules (postutates). Why did he do that? There was a large amount of spectroscopic data before him whic h no other theory could explain. So Bohr said that if we assume that an atom behaves in such a manner, we can explain all these things at once. Einstein’s special theory of relativity is also based on two postulates, the constancy of the speed f electromagnetic radiation and the validity of physical laws in all inertial frame of reference. It would not be wise to ask somebody to prove that the speed of light in vacuum is constant, independent of the source or observer. In mathematics too, we need axioms and hypotheses at every stage. Euclid’s statement that parallel lines never meet, is a hypothesis. This means that if we assume this statement, we can explain several properties of straight lines and two or three dimensional figures made out of them. But if you don’t assume it, you are free to use a different axiom and get a new geometry, as has indeed happened in he past few centuries and decades. P HYSICAL WORLD 5 theory of objects falling to the earth under gr avity. 1. 3 PHYSICS, TECHNOLOGY AND SOCIETY The connection between physics, technology and society can be seen in many examples. The discipline of thermodynamics arose from the need to understand and improve the working of heat engines. The steam engine, as we know, is inseparable from the Industrial Revolution in England in the eighteenth century, which had great impact on the course of human civilisation. Sometimes technology gives rise to new physics; at other times physics generates new technology.An example of the latter is the wireless communication technology that followed the discovery of the basic laws of electricity and magnetism in the nineteenth century. The applications of physics are not always easy to foresee. As late as 1933, the great physicist Ernest Rutherford had dismissed the possibility of tapping energy from atoms. But only a few years later, in 1938, Hahn and Meitner discovered the phenomenon of neutron-induced fission of uranium, which would serve as the bas is of nuclear power reactors and nuclear weapons. Yet another important example of physics giving rise to technology is the silicon chip’ that triggered the computer revolution in the last three decades of the twentieth century. A most significant area to which physics has and will contribute is the development of alternative energy resources. The fossil fuels of the planet are dwindling fast and there is an urgent need to discover new and affordable sources of energy. Considerable progress has already been made in this direction (for example, in conversion of solar energy, geothermal energy, etc. , into electricity), but much more is still to be accomplished. Table1. 1 lists some of the great physicists, their major contribution and the country of rigin. You will appreciate from this table the multi-cultural, international character of the scientific endeavour. Table 1. 2 lists some important technologies and the principles of physics they are based on. Obviously, these tabl es are not exhaustive. We urge you to try to add many names and items to these tables with the help of your teachers, good books and websites on science. You will find that this exercise is very educative and also great fun. And, assuredly, it will never end. The progress of science is unstoppable! Physics is the study of nature and natural phenomena. Physicists try to discover the rules hat are operating in nature, on the basis of observations, experimentation and analysis. Physics deals with certain basic rules/laws governing the natural world. What is the nature Table 1. 1 Some physicists from different countries of the world and their major contributions Name Major contribution/discovery Country of Origin Archimedes Principle of buoyancy; Principle of the lever Greece Galileo Galilei Law of inertia Italy Christiaan Huygens Wave theory of light Holland Isaac Newton Universal law of gravitation; Laws of motion; Reflecting telescope U. K. Michael Faraday Laws of electromagnetic ind uction U. K. James Clerk MaxwellElectromagnetic theory; Light-an electromagnetic wave U. K. Heinrich Rudolf Hertz Generation of electromagnetic waves Germany J. C. Bose Ultra short radio waves India W. K. Roentgen X-rays Germany J. J. Thomson Electron U. K. Marie Sklodowska Curie Discovery of radium and polonium; Studies on Poland natural radioactivity Albert Einstein Explanation of photoelectric effect; Theory of relativity Germany 6 P HYSICS Name Major contribution/discovery Country of Origin Victor Francis Hess Cosmic radiation Austria R. A. Millikan Measurement of electronic charge U. S. A. Ernest Rutherford Nuclear model of atom New Zealand Niels BohrQuantum model of hydrogen atom Denmark C. V. Raman Inelastic scattering of light by molecules India Louis Victor de Borglie Wave nature of matter France M. N. Saha Thermal ionisation India S. N. Bose Quantum statistics India Wolfgang Pauli Exclusion principle Austria Enrico Fermi Controlled nuclear fission Italy Werner Heisenberg Q uantum mechanics; Uncertainty principle Germany Paul Dirac Relativistic theory of electron; Quantum statistics U. K. Edwin Hubble Expanding universe U. S. A. Ernest Orlando Lawrence Cyclotron U. S. A. James Chadwick Neutron U. K. Hideki Yukawa Theory of nuclear forces Japan Homi Jehangir BhabhaCascade process of cosmic radiation India Lev Davidovich Landau Theory of condensed matter; Liquid helium Russia S. Chandrasekhar Chandrasekhar limit, structure and evolution of stars India John Bardeen Transistors; Theory of super conductivity U. S. A. C. H. Townes Maser; Laser U. S. A. Abdus Salam Unification of weak and electromagnetic interactions Pakistan of physical laws? We shall now discuss the nature of fundamental forces and the laws that govern the diverse phenomena of the physical world. 1. 4 FUNDAMENTAL FORCES IN NATURE* We all have an intuitive notion of force. In our experience, force is needed to push, carry or hrow objects, deform or break them. We also experience the impact o f forces on us, like when a moving object hits us or we are in a merry-goround. Going from this intuitive notion to the proper scientific concept of force is not a trivial matter. Early thinkers like Aristotle had wrong * ideas about it. The correct notion of force was arrived at by Isaac Newton in his famous laws of motion. He also gave an explicit form for the force for gravitational attraction between two bodies. We shall learn these matters in subsequent chapters. In the macroscopic world, besides the gravitational force, we encounter several kinds f forces: muscular force, contact forces between bodies, friction (which is also a contact force parallel to the surfaces in contact), the forces exerted by compressed or elongated springs and taut strings and ropes (tension), the force of buoyancy and viscous force when solids are in Sections 1. 4 and 1. 5 contain several ideas that you may not grasp fully in your first reading. However, we advise you to read them carefully to develo p a feel for some basic aspects of physics. These are some of the areas which continue to occupy the physicists today. P HYSICAL WORLD 7 Table 1. 2 Link between technology and physics TechnologyScientific principle(s) Steam engine Laws of thermodynamics Nuclear reactor Controlled nuclear fission Radio and Television Generation, propagation and detection of electromagnetic waves Computers Digital logic Lasers Light amplification by stimulated emission of radiation Production of ultra high magnetic fields Superconductivity Rocket propulsion Newton’s laws of motion Electric generator Faraday’s laws of electromagnetic induction Hydroelectric power Conversion of gravitational potential energy into electrical energy Aeroplane Bernoulli’s principle in fluid dynamics Particle accelerators Motion of charged particles in electromagnetic ields Sonar Reflection of ultrasonic waves Optical fibres Total internal reflection of light Non-reflecting coatings Thin film optical in terference Electron microscope Wave nature of electrons Photocell Photoelectric effect Fusion test reactor (Tokamak) Magnetic confinement of plasma Giant Metrewave Radio Telescope (GMRT) Detection of cosmic radio waves Bose-Einstein condensate Trapping and cooling of atoms by laser beams and magnetic fields. contact with fluids, the force due to pressure of a fluid, the force due to surface tension of a liquid, and so on. There are also forces involving charged nd magnetic bodies. In the microscopic domain again, we have electric and magnetic forces, nuclear forces involving protons and neutrons, interatomic and intermolecular forces, etc. We shall get familiar with some of these forces in later parts of this course. A great insight of the twentieth century physics is that these different forces occurring in different contexts actually arise from only a small number of fundamental forces in nature. For example, the elastic spring force arises due to the net attraction/repulsion betw een the neighbouring atoms of the spring when the spring is elongated/compressed. This net ttraction/repulsion can be traced to the (unbalanced) sum of electric forces between the charged constituents of the atoms. In principle, this means that the laws for ‘derived’ forces (such as spring force, friction) are not independent of the laws of fundamental forces in nature. The origin of these derived forces is, however, very complex. At the present stage of our understanding, we know of four fundamental forces in nature, which are described in brief here : 8 P HYSICS Albert Einstein (1879-1955) Albert Einstein, born in Ulm, Germany in 1879, is universally regarded as one of the greatest physicists of all time.His astonishing scientific career began with the publication of three path-breaking papers in 1905. In the first paper, he introduced the notion of light quanta (now called photons) and used it to explain the features of photoelectric effect that the classical wave th eory of radiation could not account for. In the second paper, he developed a theory of Brownian motion that was confirmed experimentally a few years later and provided a convincing evidence of the atomic picture of matter. The third paper gave birth to the special theory of relativity that made Einstein a legend in his own life time.In the next decade, he explored the consequences of his new theory which included, among other things, the mass-energy equivalence enshrined in his famous equation E = mc2. He also created the general version of relativity (The General Theory of Relativity), which is the modern theory of gravitation. Some of Einstein’s most significant later contributions are: the notion of stimulated emission introduced in an alternative derivation of Planck’s blackbody radiation law, static model of the universe which started modern cosmology, quantum statistics of a gas of massive bosons, and a critical analysis of the foundations of quantum mechanics.Th e year 2005 was declared as International Year of Physics, in recognition of Einstein’s monumental contribution to physics, in year 1905, describing revolutionary scientific ideas that have since influenced all of modern physics. 1. 4. 1 Gravitational Force The gravitational force is the force of mutual attraction between any two objects by virtue of their masses. It is a universal force. Every object experiences this force due to every other object in the universe. All objects on the earth, for example, experience the force of gravity due to the earth. In particular, gravity governs the motion of the moon and artificial satellites around he earth, motion of the earth and planets around the sun, and, of course, the motion of bodies falling to the earth. It plays a key role in the large-scale phenomena of the universe, such as formation and evolution of stars, galaxies and galactic clusters. 1. 4. 2 Electromagnetic Force Electromagnetic force is the force between charged parti cles. In the simpler case when charges are at rest, the force is given by Coulomb’s law : attractive for unlike charges and repulsive for like charges. Charges in motion produce magnetic effects and a magnetic field gives rise to a force on a moving charge. Electric nd magnetic effects are, in general, inseparable – hence the name electromagnetic force. Like the gravitational force, electromagnetic force acts over large distances and does not need any intervening medium. It is enormously strong compared to gravity. The electric force between two protons, for example, 36 is 10 times the gravitational force between them, for any fixed distance. Matter, as we know, consists of elementary charged constituents like electrons and protons. Since the electromagnetic force is so much stronger than the gravitational force, it dominates all phenomena at atomic and molecular scales. (The other two forces, as we hall see, operate only at nuclear scales. ) Thus it is mainly the elec tromagnetic force that governs the structure of atoms and molecules, the dynamics of chemical reactions and the mechanical, thermal and other properties of materials. It underlies the macroscopic forces like ‘tension’, ‘friction’, ‘normal force’, ‘spring force’, etc. Gravity is always attractive, while electromagnetic force can be attractive or repulsive. Another way of putting it is that mass comes only in one variety (there is no negative mass), but charge comes in two varieties : positive and negative charge. This is what makes all the difference.Matter is mostly electrically neutral (net charge is zero). Thus, electric force is largely zero and gravitational force dominates terrestrial phenomena. Electric force manifests itself in atmosphere where the atoms are ionised and that leads to lightning. P HYSICAL WORLD 9 Satyendranath Bose (1894-1974) Satyendranath Bose, born in Calcutta in 1894, is among the great Indian physicists who made a fundamental contribution to the advance of science in the twentieth century. An outstanding student throughout, Bose started his career in 1916 as a lecturer in physics in Calcutta University; five years later he joined Dacca University.Here in 1924, in a brilliant flash of insight, Bose gave a new derivation of Planck’s law, treating radiation as a gas of photons and employing new statistical methods of counting of photon states. He wrote a short paper on the subject and sent it to Einstein who immediately recognised its great significance, translated it in German and forwarded it for publication. Einstein then applied the same method to a gas of molecules. The key new conceptual ingredient in Bose’s work was that the particles were regarded as indistinguishable, a radical departure from the assumption that underlies the classical MaxwellBoltzmann statistics.It was soon realised that the new Bose-Einstein statistics was applicable to particles with integers spins, and a new quantum statistics (Fermi-Dirac statistics) was needed for particles with half integers spins satisfying Pauli’s exclusion principle. Particles with integers spins are now known as bosons in honour of Bose. An important consequence of Bose-Einstein statistics is that a gas of molecules below a certain temperature will undergo a phase transition to a state where a large fraction of atoms populate the same lowest energy state.Some seventy years were to pass before the pioneering ideas of Bose, developed further by Einstein, were dramatically confirmed in the observation of a new state of matter in a dilute gas of ultra cold alkali atoms – the Bose-Eintein condensate. If we reflect a little, the enormous strength of the electromagnetic force compared to gravity is evident in our daily life. When we hold a book in our hand, we are balancing the gravitational force on the book due to the huge mass of the earth by the ‘normal force’ provided by our hand. The latter is nothing but the net electromagnetic force between the charged constituents of our hand and he book, at the surface in contact. If electromagnetic force were not intrinsically so much stronger than gravity, the hand of the strongest man would crumble under the weight of a feather ! Indeed, to be consistent, in that circumstance, we ourselves would crumble under our own weight ! 1. 4. 3 Strong Nuclear Force The strong nuclear force binds protons and neutrons in a nucleus. It is evident that without some attractive force, a nucleus will be unstable due to the electric repulsion between its protons. This attractive force cannot be gravitational since force of gravity is negligible compared to the electric force.A new basic force must, therefore, be invoked. The strong nuclear force is the strongest of all fundamental forces, about 100 times the electromagnetic force in strength. It is charge-independent and acts equally between a proton and a proton, a neutron a nd a neutron, and a proton and a neutron. Its range is, however, extremely small, –15 of about nuclear dimensions (10 m). It is responsible for the stability of nuclei. The electron, it must be noted, does not experience this force. Recent developments have, however, indicated that protons and neutrons are built out of still more elementary constituents called quarks. . 4. 4 Weak Nuclear Force The weak nuclear force appears only in certain nuclear processes such as the ? -decay of a nucleus. In ? -decay, the nucleus emits an electron and an uncharged particle called neutrino. The weak nuclear force is not as weak as the gravitational force, but much weaker than the strong nuclear and electromagnetic forces. The range of weak nuclear force is exceedingly small, of the order of 10-16 m. 1. 4. 5 Towards Unification of Forces We remarked in section 1. 1 that unification is a basic quest in physics. Great advances in physics often amount to unification of different 10 P HYSICS Tab le 1. Fundamental forces of nature Name Relative strength Range Operates among Gravitational force 10 –39 Infinite All objects in the universe Weak nuclear force 10–13 Very short, Sub-nuclear size ( ? –16 m) 10 Some elementary particles, particularly electron and neutrino Electromagnetic force 10–2 Infinite Charged particles Strong nuclear force 1 Short, nuclear size ( ? –15 m) 10 Nucleons, heavier elementary particles theories and domains. Newton unified terrestrial and celestial domains under a common law of gravitation. The experimental discoveries of Oersted and Faraday showed that electric and magnetic phenomena are in general nseparable. Maxwell unified electromagnetism and optics with the discovery that light is an electromagnetic wave. Einstein attempted to unify gravity and electromagnetism but could not succeed in this venture. But this did not deter physicists from zealously pursuing the goal of unification of forces. Recent decades have seen much progress on this front. The electromagnetic and the weak nuclear force have now been unified and are seen as aspects of a single ‘electro-weak’ force. What this unification actually means cannot be explained here. Attempts have been (and are being) made to unify the electro-weak and the trong force and even to unify the gravitational force with the rest of the fundamental forces. Many of these ideas are still speculative and inconclusive. Table 1. 4 summarises some of the milestones in the progress towards unification of forces in nature. 1. 5 NATURE OF PHYSICAL LAWS Physicists explore the universe. Their investigations, based on scientific processes, range from particles that are smaller than atoms in size to stars that are very far away. In addition to finding the facts by observation and experimentation, physicists attempt to discover the laws that summarise (often as mathematical quations) these facts. In any physical phenomenon governed by different forc es, several quantities may change with time. A remarkable fact is that some special physical quantities, however, remain constant in time. They are the conserved quantities of nature. Understanding these conservation principles is very important to describe the observed phenomena quantitatively. For motion under an external conservative force, the total mechanical energy i. e. the sum of kinetic and potential energy of a body is a constant. The familiar example is the free fall of an object under gravity. Both the kinetic energy