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Search results 10481 - 10490 of 12257 matching essays
- 10481: Simple Machines
- ... t. Machines can never be 100% efficient because of friction. In a Ideal world there is no friction but we don't live in a ideal world. We have friction and efficiency is not always high or low but it is never 100%. Added discussion Believe it or not your arm is a simple machine. Your arm is a form of lever. The muscles and bones work together as levers. The ...
- 10482: Nuclear Waste Disposal At Yucca Mountain: Right or Wrong?
- ... While the Yucca Mountains are the best site we have found as of yet, this procedure will cost a huge amount of taxpayer dollars. The Department of Energy (DOE) estimates the total cost of its high-level waste management program at $25-35 billion. Completing the scientific investigation and licensing of the Yucca Mountain site is expected to cost $6-7 billion alone. At the end of 1993, total nuclear waste ...
- 10483: Nuclear Energy: Uranium Fission
- ... 25 tons of spent fuel. This product is highly radioactive and gives off a great deal of heat. However, it can be reprocessed so that 97% can be recycled. The remaining 3%, about 700kg, is high-level radioactive waste that needs to be isolated from the environment for many years (Gale 22). This small quantity makes the task readily manageable. Even if the fuel is not reprocessed, the yearly amount of ...
- 10484: What Is Physics and What Are Its Uses?
- ... keep the batter from using his energy to try and hit the ball. The batter exhibits the need for a certain trajectory because he/she needs to hit the ball hard enough and keep it high enough to sail over the outfield wall. On the other hand, the batter must be certain to keep the trajectory low enough so that the ball will reach the fence. Trajectory is also seen in ...
- 10485: Fiber Optics
- ... Imax is referred to as the half-angle of the fibre, since it describes half the field of view acceptably transmitted. The numerical aperture (and hence Imax) can be increased by using a core of high refractive index. However, these glasses have a lower efficiency of transmission, especially at the blue end of the spectrum, and are not commonly used. The above analysis applies only to a straight line fibre. If ...
- 10486: Black Holes
- ... occurs. When the star is passed on into the event horizon the light that the star endures is bent within the current and therefore cannot be seen in space. At this exact point in time, high amounts of radiation are given off, and with the proper equipment, can be detected and seen as an image of a black hole. Through this technique, astronomers now believe that they have found a black ...
- 10487: The Application of Science to Engineering
- ... Through chemical studies it was discovered that the kilns had to be heated up to temperatures of 1400 to 1650 degrees Celsius in order to cure the cement properly. To heat the kilns to these high temperatures new materials had to be developed to insulate them. It became possible to manufacture cement strong and durable enough for manufacturing. Sand, gravel and crushed rock were added to the cement to produce concrete ...
- 10488: Minerals
- ... forming bones. Sodium is another kind of mineral. Sodium is usually found in small but ok quantities in natural foods. If you have too much sodium it may cause edema. It may also give you high blood pressure. Iron is needed to form pigments in red blood cells. These cells transport the oxygen we need. men have more iron in there blood stream then women. You should have about 18 mg ...
- 10489: Salt and Its Uses
- ... now beginning to feel that salt has gone too far. At the University of Alabama, a short-term research has been done on 150 people on the effect of the intake of salt related to high blood pressure. Result shows that those with normal blood pressure experience no change at all when placed in a extremely low salt diet, or later when salt was introduced, Of the hypertensive subjects, half of ...
- 10490: Environmental Crisis
- ... year 2000, the Chinese population is officially projected to top the 1.3 billion mark. About two-thirds of this 900 million increase was added within the last 50 years, as mortality was reduced amid high fertility rates. The Chinese government has been moved by this "demographic affluence" to curb fertility. China's strategic demographic initiatives (SDI) were contrived out of this need. The government installed numerous measures for curbing fertility ...
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