Newton's Cannon - In Unity
Автор: Alec Karfonta
Загружено: 2014-12-23
Просмотров: 21539
Описание:
Newton imagined a giant cannon capable of firing cannonballs at any velocity. If the cannonball is fired at a normal speed it will travel on an arc and fall to the Earth. Increasing the cannonball's speed will increase the distance traveled and widen the arc. With enough speed the cannonball's downward motion, caused by the pull of gravity, will be matched by the curvature of the Earth.
The cannonball would continuously fall around the Earth, because it has attained such a great horizontal speed it never gets any closer to the Earth. The International Space Station, and most communications satellites, reside in a range of distances known as Low Earth Orbit, 200-2000 kilometers from the surface. At 200 kilometers up, to exactly counteract gravity's downward pull, a satellite must maintain a speed of 7,800 meters per second, or 17,448 miles per hour, perpendicular to the earth. That is just to stay in orbit, to leave you have to go even faster.
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