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) is222trunkleg0.660 kg m1.44 kg m2.10 kg m .iIII=+=⋅+⋅=⋅Similarly, her final rotational inertia (trunk and bothlegs extending outward at a 30θ=°angle) is222trunkleg2sin0.660 kg m2(1.44 kg m )sin 301.38 kg m ,fI=⋅+⋅°=⋅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.