gc textbook chapter 8 Rotational Motion (id: d72956442)

[问答题]
A shortstop may leap into the air y w: gv um;8x3gd :xm3)ja,sf+ez6 dn;nk-hmo to catch a ball and thr m. ;dbmm )jvfm5jaj-9ow 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 opposite directijb9 ajjf vd5mm)m .;-mon (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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