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 being able to rknq.;5n s(y j9ip(flpun fast have slender lower legs with fles 6lg8ij s2a( 9dzru*p b d/josnk,gn17h and muscle concentrated high, close to the body (Fig. 8–34). On the basis on,g 9z2j noar71dd/s*l6 (sji 8p gkubf 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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