gc textbook chapter 8 Rotational Motion (id: d518b82e2)

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本题目来源于试卷: gc textbook chapter 8 Rotational Motion，类别为 unclassified

[问答题]
A person stands, hands at his szkbkfrp1o3 ++ l-rnk /ide, on a platform that is rotating at mw7vx5)dpbpwr.)q * g a rate of 1.3revp)g bw*)mr5q.7 xvwdp/s If he raises his arms to a horizontal position, Fig. 8–48, the speed of rotation decreases to 0.8 $rev/s$ (a) Why?
(b) By what factor has his moment of inertia changed?

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