Air Resistance, Tyres And Friction Essays - Classical Mechanics

Air Resistance, Tyres and Friction Blake Smith Dragsters use a combination of large wide tyres or the rear and small narrow tyres on the front this combination is used for the following reasons: The front wheels: The front wheels are very narrow. This is so a minimum of air resistance or drag affects the dragster with lower drag better acceleration an in turn a better top speed can be achieved all leading to a better pass (race time). Now lets try to understand the concept of air resistance and drag. A basic example is placing your hand out the window with your palm facing forwards as you are driving your car along at about sixty kilometres per hour. You will feel a strong force of the wind (air resistance) pushing back at your hand. Now turn your hand side or so that your little finger is facing the front and your thumb is facing the rear at the same speed. The force of air resistance exerted on your hand is greatly reduced. This force is similar as to that exerted on the front wheels of the dragster. Now dragsters reach speeds of up to five hundred kilometres per hour, imagine the force needed to hold your hand against the wind if your palm was facing the front. It would be much easier to hold your hand side on. The same as it would be much easier for the dragsters engine to push the narrow front wheels compared to large ones. Air resistance is a form of friction (namely fluid friction) a friction from the air, as we know friction is defined as a force that opposes movement. The formula used to determine aerodynamic drag is as follows: Drag = 0.5 * rho * Cd * v2 * S Aerodynamic drag is a function of the following: - rho is the air density, which we cannot change. - v2 is velocity squared which is endeavoured to be maximized for the best time and/or pass. - S is the frontal or cross sectional area which we want to minimize. I.e. less frontal area means that a less significant amount of air resistance impedes the top speed and acceleration. - Cd is the coefficient of drag, which we want to minimize. So the two things with which can be worked with or changed, the frontal area and coefficient of drag, both of which need to be to minimized for the best results. Having very narrow front wheels minimizes the frontal area. This is the main reason why narrow front wheels are used. If the smaller the wheel the lower the drag, why not have the wheels narrow and very short as well? You ask. Well the reason is that if the wheels were very small they would drop into all the bumps and cause a loss of speed not to mention control. As the wheels would bounce into the depression and then launch up into the air as they come out of the bump. This is extremely dangerous in that the driver can no longer steer the vehicle that is travelling at near five hundred kilometres per hour, the car can also get air flowing underneath the car, with the effect of air resistance the car will lift up of the ground and flip through the air. Also the rotational force is much harder on the bearings causing more wear and friction meaning slower times. Large wheels are used because they will skim over the bumps and keep the car moving along a flat plane. They also exert less force on the bearings meaning less friction and better times. Now if drag cars use narrow front wheels so they can get less air resistance and a better top speed why don?t all racing vehicles run narrow front wheels? The answer is friction. The front wheels of drag cars do not have high cornering or driving force travelling trough them. I.e. they are only there to hold the front of the car up and allow it to roll along the road. In conventional racecars high forces are exerted on the tyre in the horizontal plane meaning that they need to have a good tread area so that they grip the road well and hold the car on the track so it does not slide off

Film analysis comparing The Ice Storm and Do The Right Thing Essay

Film analysis comparing The Ice Storm and Do The Right Thing - Essay Example Some of those visions are more correct than others; some of them are more cynical than others. The Ice Storm and Do the Right Thing are two unforgiving glimpses at what can happen when proprieties fall to the side; watching them makes me feel as though all of the horrid visions that Nathaniel Hawthorne and Herman Melville had for modernity, when they were so outraged by the notions of Transcendentalism and Romanticism that their quills virtually skied across the parchment, have all come to pass. It is the detail, as usual, that sets these two films above many of their contemporaries, in terms of expressing their vision of the way we are – or at least the way we shouldnt be. The Ice Storm shows director Ang Lees usual flair for the extremely precise, in terms of dà ©cor and set. The G.I. Joe doll, sitting askew and yelling â€Å"May Day! May Day!† is just one symbol of the existential chaos that has ensued in the years leading up to Thanksgiving, 1973. The music and dà ©cor take one back to the era of The Streets of San Francisco or Hawaii Five-O, all the way down to such details as the trendy water bed that Sigourney Weavers character sleeps on, the Philip Roth novel she is reading, and even the metal ice tray that Kevin Klines character empties each night. The architecture follows suit, with the modern glass walls that came into vogue in those days keeping the families inside during the ice storm – but able to see the entire thing. While The Ice Storm is an analysis of an era – the days around Watergate – Do the Right Thing is an analysis of a vicious racial incident in Brooklyn – the Howard Beach attack on a group of black youths. While The Ice Storm is eerily quiet at times, Do the Right Thing hums with noise – not just the militant rap tunes by Public Enemy and other artists, but there is also the sound of urban life, piped into the movie virtually from beginning to end. It is as though director Spike Lee knows how sound can

Study of Factors and Approaches Influencing Implementation of ERP Essay

Study of Factors and Approaches Influencing Implementation of ERP Systems - Essay Example It is unclear from both the text and the table, what the source of these tables is. It is important to refer to, explain and even evaluate these tables in your text. | 7) In chapter 5, you must include a proper conclusion. Does your research answer the research questions you posed in chapter 1? Have you fulfilled your research objectives? Please be explicit in stating the extent to which you are satisfied with your work. It is okay to say that some elements did not work as you expected. If you were to do this research again, in what way would you do it differently? We are not looking for à ¢Ã¢â€š ¬Ã‹Å"rightà ¢Ã¢â€š ¬Ã¢â€ž ¢ answers as we assess your work. We are looking for a critical, justified, evidenced, coherent evaluation of the research study and its process. Chung, B. (2007). An Analysis of Success and Failure Factors for ERP Systems in Engineering and Construction Firms. Retrieved December 19, 2010, from Digiral Repository of University of Maryland: http://drum.lib.umd.edu/bitstream/1903/7644/1/umi-umd-4917.pdf Srivastava, R. (2003). Learning from Failed ERP implementation or How to make em Successful. Retrieved December 19, 2010, from Apps to Fusion:

The visibility of the Environmental reports Essay

The visibility of the Environmental reports - Essay Example 1. The elevation of social accountability and the current reach of the environmental responsibility of the corporate world? Is environmental responsibility addressing the real concerns or is it a public propaganda? 2. Prior research indicates that the firms used to elevate the social accountability as an employee welfare activity and ignore other related important operational information. A very little has been done to the environment improvement. There is no sustainable development but firms used to highlight specific events they have had organized. Firms from the seventies started concerning about environment to please the public and to get approved by the environmental & other governing authorities. The stringent laws imposed in response to the rapid pollution worldwide the firms were forced to abide the regulations specified by concerned authorities. 3. Socio Economic theory was used to examine the social accountability of the firm. 4. The theory describes about the authenticity of the disclosures about the environmental responsibility. The Socioeconomic theory demands for the release of both the extremes of the facts about the environment accountability of the firm which many companies were not providing at that time. The theory demands that the environmental reports are to released with the annual reports to enhance the accountability and visibility of the firm towards environmental awareness. However the firms used to release a separate report about the environment.

Questions for Consideration (4-6) Assignment Example | Topics and Well Written Essays - 250 words

Questions for Consideration (4-6) - Assignment Example Therefore, the proxy statement would provide information on the salaries, bonuses and other compensations of the top level management. This information can be used by investors to determine how reliable the executives are with the hefty amounts of assets to manage. In my opinion, the most basic and important section of the proxy statement is section on accountants and the payment extended to the external auditors. The disclosure of the additional fees paid to auditors would be used to detect any cases of fraud and bribery. This is because auditors have the ability to unearth existing fraud of funds in a company at the expense of shareholders (Palmiter 175). Cash flows can be used to gauge a company’s performance. This is because cash flows show the money used in all aspects of an organization’s operations and transactions. This includes the cash used to buy assets, money raised by investors and financing from loans. Since these aspects help a company to generate earnings, then cash flows can be used to measure performance. The EBITDA can be used to gauge a company’s performance. It entails earnings before interest, taxes, depreciation and amortization. The basis of its use is that it reflects the happenings in all core operations of a company while disregarding expenses that are considered irrelevant. Net income can also be used to measure a company’s performance. This is because income indicates the earnings made in surplus of the least expected income on the operating assets. Income also shows the value added after an organization’s operations. Both EBITDA and pro forma earnings are both intended to reveal the true operating earnings of a company. The methods also portray how companies’ main operations have performed. In both methods, the management decides what expenses are relevant to the ongoing company’s

Employee Benefits-Medical Plans and Health Care Research Paper

Employee Benefits-Medical Plans and Health Care - Research Paper Example The rising trend of health care cost can be attributed to the increase in prices of care especially due to consolidation of the hospital industry. Hospitals have been spending much on ensuring effective provision of health care services. Recently, the prices of all major categories of health care such as surgical procedures and hospital stays. Consolidation of hospitals through mergers and acquisitions has also contributed largely to increase in the cost of health care. For instance, prices of hospital health care services rose by 33% between 2009 and 2010Â   when there were major cases of mergers and acquisitions. The cost of provider services in the United States in very high than other countries such as Europe. This is due to increased spending on clinical and physical services. One of the leading reason is the high prevalent rate of obesity in the United States which require adequate medical spending. The medical field has also been characterized by regular advancement in medica l technology which has significantly influenced an upward shift in the cost of care services. Of the overall 65 % increase in prices of health care spending, 30% of can be tracked spending on the implementation of medical technologies. The new technology is required in hospitals as it expands the options available for the treatment of different medical needs. However, the approach involves replacing lower-cost medical procedures and options with those that are higher cost. Healthcare benefits cost-sharing has become very strained.

The visibility of the Environmental reports Essay

The visibility of the Environmental reports - Essay Example 1. The elevation of social accountability and the current reach of the environmental responsibility of the corporate world? Is environmental responsibility addressing the real concerns or is it a public propaganda? 2. Prior research indicates that the firms used to elevate the social accountability as an employee welfare activity and ignore other related important operational information. A very little has been done to the environment improvement. There is no sustainable development but firms used to highlight specific events they have had organized. Firms from the seventies started concerning about environment to please the public and to get approved by the environmental & other governing authorities. The stringent laws imposed in response to the rapid pollution worldwide the firms were forced to abide the regulations specified by concerned authorities. 3. Socio Economic theory was used to examine the social accountability of the firm. 4. The theory describes about the authenticity of the disclosures about the environmental responsibility. The Socioeconomic theory demands for the release of both the extremes of the facts about the environment accountability of the firm which many companies were not providing at that time. The theory demands that the environmental reports are to released with the annual reports to enhance the accountability and visibility of the firm towards environmental awareness. However the firms used to release a separate report about the environment.