Newton's laws Essay Example | Topics and Well Written Essays - 1250 words

Newton's laws - Essay Example Newton's laws of motion (law of inertia, fundamental law of dynamics, law of reciprocal actions) were verified by experiment and observation for over 200 years, and they are excellent approximations at the scales and speeds of everyday life. At the atomic scale, they become a poorer approximation to quantum mechanics, and at speeds comparable to the speed of light, they become a poorer approximation to relativity. Just as they fail for material objects moving at speeds close to the speed of light, they fail for light itself. Newton's first law appeared to be in the past just a special case of the second law, and it was thought Newton stated the first law separately simply in order to throw down the gauntlet to the Aristotelians. However, modern physicists think that the First Law defines the reference frames in which the other two laws are valid. These reference frames are called inertial reference frames or Galilean reference frames, and are moving at constant velocity, that is to say, without acceleration. (Note that an object may have a constant speed through its motion path and yet have a non-zero acceleration, as in the case of uniform circular motion. This means that the surface of the Earth is not an inertial reference frame, since the Earth is rotating on its axis and orbits around the Sun. However, for many experiments, the Earth's surface can safely be assumed to be inertial. The law of gravity became Sir Isaac Newton's best-known discovery. Newton warned against using it to view the universe as a mere machine, like a great clock.

Population Research Paper Example | Topics and Well Written Essays - 1000 words

Population - Research Paper Example Countries Rank by Total Fertility Rate (TFR) Rank Countries Children Born /Woman Date of Information 1 Zambia 5.81 2013 2 Nigeria 5.31 2013 3 Tanzania 5.01 2013 4 Senegal 4.61 2013 5 Ghana 4.12 2013 6 Cameroon 4.00 2013 7 Kenya 3.76 2013 8 Zimbabwe 3.58 2013 9 Egypt 2.90 2013 10 Kuwait 2.56 2013 11 South Africa 2.25 2013 12 United States 2.06 2013 13 United Kingdom 1.90 2013 14 Brazil 1.81 2013 15 China 1.55 2013 Source: (3Central Intelligence Agency 2013). ... For example, developing countries such as Zambia and Cameroon rank higher in terms of TFR and MMR than developed countries such as the US and the UK. Correspondingly, it can be stated that there exists a direct relationship between TFR and MMR. Evidently, the decline in fertility leads to decrease in the exposure of risks associated with maternal mortality and vice versa (1Central Intelligence Agency 2013; 2Central Intelligence Agency 2013) Rank the Countries by Infant Mortality Rate (IMR) Rank Countries Death/1000 Live Births Date of Information 1 Nigeria 72.97 2013 2 Zambia 68.58 2013 3 Cameroon 58.51 2013 4 Senegal 53.93 2013 5 Tanzania 45.10 2013 6 Kenya 42.18 2013 7 South Africa 42.15 2013 8 Ghana 39.70 2013 9 Zimbabwe 27.25 2013 10 Egypt 23.30 2013 11 Brazil 19.83 2013 12 China 15.20 2013 13 Kuwait 7.68 2013 14 United States 5.90 2013 15 United Kingdom 4.50 2013 Source: (Central Intelligence Agency 2013). Rank by Life Expectancy at Birth Rank Countries Years Date of Information 1 United Kingdom 80.29 2013 2 United States 78.62 2013 3 Kuwait 77.46 2013 4 China 74.99 2013 5 Egypt 73.19 2013 6 Brazil 73.02 2013 7 Ghana 65.32 2013 8 Kenya 63.29 2013 9 Tanzania 60.76 2013 10 Senegal 60.57 2013 11 Cameroon 55.02 2013 12 Zimbabwe 53.86 2013 13 Nigeria 52.46 2013 14 Zambia 51.51 2013 15 South Africa 49.48 2013 Source: (1Central Intelligence Agency 2013). Population Growth Rate (Measured By Total Fertility Rate) Varies With Infant Mortality Rate and Life Expectancy at Birth It has been determined from the above presented charts that infant mortality rate is higher in developing countries than developed countries. On the contrary, life expectancy rate at birth is higher in developed countries than developing countries. Correspondingly,