# fri 4 - Physics 2211 Friday April 4th 2008 Universal...

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Unformatted text preview: Physics 2211 Friday April 4th, 2008 Universal Gravitation (12.512.6) PRS The gravitational potential energy in a system of two objects masses m1 and m2 separated by a distance r is... Proportional to 1/r2 F=G M1M2/r2 PRS Suppose you want to ride a bike up a steep hill. Two paths lead to the top, one twice as long as the other. If your power output is the same, how do your two times compare? Both paths take the same amount of time. Both paths are the same distance. The potential energy and power is the same, so the time will be the same. Power is the work done in a given time. PRS A ball is launched up into the and it experiences a force of drag. How does the time up compare to the time down? Less time going up than going down PRS An object of mass m is falling towards Earth starting from rest. What initial and final values for r can we use in finding its speed? Ri=infinity Rf=R(surface of the Earth) PRS An object is launched from Earth, and it order for it never to fall back down, what speed must if leave Earth? Any speed greater than or qual to square root(2GM/r) ...
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## This note was uploaded on 04/07/2008 for the course PHYSICS 2211 taught by Professor Uzer during the Spring '08 term at Georgia Tech.

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fri 4 - Physics 2211 Friday April 4th 2008 Universal...

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