gc textbook chapter 8 Rotational Motion (id: d72956442)

[问答题]
A shortstop may leap iux.bru.r)d e,zl.s c4xh1mos8 itq,0 nto t 47/d;tnqx h .aflh:xahe air to catch a ball and throw it quickly. As he throws the ball, the upper part of his body rotates. If you /x.:fqdaatn4 l7xh ;hlook 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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