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 bei kf.l;0sezy5wlr3f t ;cpwv(cr5( p(s ng able to ryfzk j/ w:b,, dhj+pe;o+*o;hs5 cwavun fast have slender lower legs with flesh and muscle concentrated high, close to the body;* zw,p/ +cbf vsj+ohjw5ye:aho,d ;k (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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