gc textbook chapter 8 Rotational Motion (id: d72956442)

[问答题]
A shortstop may leap inpz kktsz0 +t ) ajch7rqz68*)wto the thw 8ok*5b h8mq/o r*vs u-fue:ao,0tair to catch a ball and throw it quickly. As he throws the ball, the upper part of his body rotates. If you look quick,:08ousbwo*qtr to5 /af - 8uhhme*kv ly 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.


本题详细解析: 暂无