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, handst/ezhavnqjra;: *1b2nf3 g,t reep1 .gu5kc5) t4z smat his side, on a platform that is rotating at a rate of 1.3rev/s If he raises his arms to a5m e)t5c 1 zkgsu4.epr 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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