gc textbook chapter 8 Rotational Motion (id: d72956442)

[问答题]
A shortstop may leap m);x ac-g iv0leke5a 74og -vqinto the air to catch ;cxp*8pe/dyb 8t( yfla ball and throw it quickly. As he throws the ball, the upper part of his body rotates. If you look quickly you will notice that his hips *l/c b8 pxfyd8ep(;tyand 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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