ch11-p062 - 62. We treat the ballerina as a rigid object...

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62. We treat the ballerina as a rigid object rotating around a fixed axis, initially and then again near maximum height. Her initial rotational inertia (trunk and one leg extending outward at a 90 ° angle) is 22 2 trunk leg 0.660 kg m 1.44 kg m 2.10 kg m . i II I =+ = + = Similarly, her final rotational inertia (trunk and both legs extending outward at a 30 θ angle) is 2 2 2 trunk leg 2 sin 0.660 kg m 2(1.44 kg m )sin 30 1.38 kg m , f I = + ° = where we have used the fact that the effective length of the extended leg at an angle
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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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