gc textbook chapter 8 Rotational Motion (id: a78c718ff)

[问答题]
Mammals that depend on being vv c51(+b2vab a9dlqiable to run fast have slender lower legs with fle,cv7w5pim6 km, ewt. qp.e 4pesh and muscle concentrated high, close to the body (Fig. 8–34). On the basis of rotational dynamics,pev mtm6p.k7p w,,5 4ci .weqe 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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