# C12 - which is initially at rest. Is a “perfect 45º...

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C12: Power, Energy, and Collisions

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A satellite of mass m and a planet with mass M are approaching each other. When the satellite and the planet are far apart, the velocities of the satellite and planet have the opposite direction. The speed of the satellite is v and the planet’s speed is V. The satellite circles around the planet, and heads directly away from the planet. What is the Fnal speed of the satellite when it is again far from the planet? Assume the satellite is much lighter than the planet.
Concept Test On an air table, a white puck is initially moving toward the red puck,

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Unformatted text preview: which is initially at rest. Is a “perfect 45º split” after the collision (illustrated above) compatible with energy and momentum conservation? Assume the collisions are elastic and the pucks all have the same mass. 1. Yes 2. No 3. Maybe (need more information) Every minute, about 10 5 cubic meters of water goes over Niagra Falls, which are about 50 m high. If we built a dam that converted all this energy to electricity with 10% ef±ciency and sold for 6¢ per kW hr, how much money would it make in a year?...
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## This note was uploaded on 03/01/2012 for the course PHY 9HA taught by Professor Markusluty during the Fall '10 term at UC Davis.

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C12 - which is initially at rest. Is a “perfect 45º...

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