gc textbook chapter 8 Rotational Motion (id: ec2d220d5)

[问答题]
Can the diver of Fig. 8–29 do a somersault w( owdenr7 y:7nithout having any initial rotatif+) m; 1 7k8pltyqrgfuon when she leaves the boardtmrg uy8f; k +l7qpf)1?

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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