gc textbook chapter 8 Rotational Motion (id: ec2d220d5)

[问答题]
Can the diver of Fig. 2u y(d4f2suws j-dh p.8–29 do fq)qtv ohrgr l/27psx:y0 ) p(a somersault without having any initial rotation when she leaves the x)yvq0f/(t :lrsgp27ro)h pq board?

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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