本题目来源于试卷: gc textbook chapter 8 Rotational Motion,类别为 unclassified
[问答题]
A shortstop may leap intowdwsi4- sl(cleoc j, o7yw;1* the air to catch a ball and throw it quickl3+1xn -mv u fxhfc4cvsrxa,*;y. As he throws the ball, the upper part of his body rotates. If you look quickly you will no - n+s;fm4ruc,f cv* xhx31xavtice 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.
本题详细解析:
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