[问答题]
Can the diver of Fig. 8–29 +m*bnb,)sdn q dow5b t vsp:9:mk a somersault without having any initial rotation when she leaves tv mp tkbw:s59:he 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.
