ch11-p043 - 43. (a) No external torques act on the system...

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() 2 2 6.0kg m 1.2rev s 3.6rev s. 2.0kg m i fi f I I ωω §· == = ¨¸ ©¹ (b) The initial kinetic energy is KI ii i = 1 2 2 ω , the final kinetic energy is ff f = 1 2 2 , and their ratio is 2 2 2 2 2 2 2.0kg m 3.6rev s / 2 /2 3.0. 6.0kg m 1.2rev s / 2 f i = (c) The man did work in decreasing the rotational inertia by pulling the bricks closer to his body. This energy came from the man’s store of internal energy. 43. (a) No external torques act on the system consisting of the man, bricks, and platform,
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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