gc textbook chapter 8 Rotational Motion (id: d72956442)

[问答题]
A shortstop may leap int s /blg a;l0/jzi qzyu2h))d*f ld(i*ao the air to *pf kjc4,au;fcatch a ball and throw it quickly. As he throws the ball, the upperjk u 4cf;,*paf part of his body rotates. If you look quickly you will notice that his hips and legs rotate in the opposite direction (Fig. 8–36). Explain.

参考答案:
The shortstop, while in mid-air, cannot exert a torque on himself, and so his angular momentum will be conserved while in the air.  If the upper half of his body rotates in a certain direction during the throwing motion, then to conserve angular momentum, the lower half of his body will rotate in the opposite direction.


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