gc textbook chapter 8 Rotational Motion (id: ec2d220d5)

[问答题]
Can the diver of Fig. 8di2shapm +.m6q;et4 w–29 do a somersaub9vt q*1 x+pxmlt without having any initial rotation when she leaves the board?pb mqt9 v1xx*+

参考答案:

In order to do a somersault, the diver needs some initial angular momentum when she leaves the diving board, because angular momentum will be conserved during the free-fall motion of the dive.  She cannot exert a torque on herself in isolation, and so if there is no angular momentum initially, there will be no rotation during the rest of the dive.

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