[问答题]
Can the diver of Fig. 8–29 do a somersau(m qj:kh ) hlt-zsbm90lt without having any initial rotation r( qn/5rj;:n)ytmu2dq: an p ue-8vg nwhen she le2e5d 8p:mvn;q(n rn/ynar u qug)-tj:aves the 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.
Post time 2025-2-18 20:00:22
