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 run fast have slender lower legs wia-.kirq n/3 mfs 9r+.(mt n2kbj/elvkth flesh / .-2k rba e.sktnvm9 /l(r3ik+njfmqd)fm r (wq94; sqon*za and muscle concentrated high, close to the body (Fig. 8–34). On t4nwqd9(mo)fqa *sz r ;he 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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