gc textbook chapter 8 Rotational Motion (id: d72956442)

[问答题]
A shortstop may leap into the air to catch a ball and trtj.uy ;bo6ak,0;lgd m (wp;mhrowgk yju*6(eqr+t3i b, ra/ n3zv it quickly. As he throws the ball, the upper part of his body rotates. If you look quickly you will notice that his hips and legs rotate in the oppos3+6 ru n*k,qa(r3yzeb /itgjvite 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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