PHY 121 Ch 12b Lecture

PHY 121 Ch 12b Lecture - Lecture 22 Tuesday, April 15 1 For...

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1 Lecture 22 Tuesday, April 15
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2 For an object in circular orbit, the total mechanical energy E is A. negative and equal to one-half the potential energy. B. positive and equal to one-half the potential energy. C. positive and equal to twice the kinetic energy. D. negative and equal to the potential energy.
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3 Your personal spacecraft is in a low- altitude circular orbit around the earth. Air resistance from the outer regions of the atmosphere des negative work on the space craft, causing the orbital radius to decrease slightly. The speed of the spacecraft A. increases. B. decreases. C. remains the same. D. not enough information to tell.
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The angular momentum L of a planet orbiting a star A. is inversely proportional to the distance r from the planet to the star. B. is inversely proportional to the square of the distance r from the planet to the star. C. is proportional to the square of the distance r from the planet to the star. D. is constant.
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This note was uploaded on 10/05/2008 for the course PHY 121 taught by Professor Chamberlin during the Spring '08 term at ASU.

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PHY 121 Ch 12b Lecture - Lecture 22 Tuesday, April 15 1 For...

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