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12_P90InstructorSolution - 12.90 Model Model the skater as...

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12.90. Model: Model the skater as a cylindrical torso with two rod-like arms that are perpendicular to the axis of the torso in the initial position and collapse into the torso in the final position. Visualize: Solve: For the initial position, the moment of inertia is 1T o r s o A r m 2. II I =+ The moment of inertia of each arm is that of a 66 cm long rod rotating about a point 10 cm from its end, and can be found using the parallel-axis theorem. In the final position, the moment of inertia is
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