gc textbook chapter 8 Rotational Motion (id: d72956442)

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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.


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