gc textbook chapter 8 Rotational Motion (id: d72956442)

[问答题]
A shortstop may leap into the air to catch a ball and throw itlg2uwmji2q 8- fcv :i: qmj rw2lw,/2eu:i gh il-cj/,p i+h vn9uickly. As he throws the ball, the upper part of his body l e rwn,vh+ip2 9/gu-/chjlwji 2mi,: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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