gc textbook chapter 8 Rotational Motion (id: a78c718ff)

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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]
Mammals that depend on bu4 zv+k,.pzwy 1d:djpks5 td/eing able to run fast have slender lower legs with fle 9hgppvdqoy 0 ea:tg iu);+u6x6.rr: zsh and muscluyp+ir ;h6 tao0 )ux.:z6g vqgper9:de concentrated high, close to the body (Fig. 8–34). On the basis of rotational dynamics, explain why this distribution of mass is advantageous.

参考答案:

The legs have a lower moment of inertia when the leg mass is concentrated next to the body.  That means the legs will require less torque to have a given angular acceleration, or, alternatively, a higher angular acceleration can be developed.  Thus the animal can run fast.

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