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 beingrx7i i 5sao1+ 6r(bkg(b5zkc m able to g2d7bs: 2w6ggjm7u8opxpi8o run fast have slender lower legs with flesh and muscle concentrated high, close to the body (Fig. 8–34). On the basis of rotational dynamics, explain why this distribution of masgog2 u7dg82 x:bppjiwsmo78 6s 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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