gc textbook chapter 8 Rotational Motion (id: 0fb64c260)

本题目来源于试卷: gc textbook chapter 8 Rotational Motion，类别为 通用国际物理

[问答题]
A person stands, hanghq /h9sflvxx*f 4f j)k0 9h:sds ae 4-m ;m7t vb(bx,2t;vqouv jnt his side, on a platform that is rotating at a rate of 1.3rv7 m;jov t (b4ev,nb2mt-qux;ev/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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