[问答题]
Can the diver of Fig. 8–29 do a somersault wi gcg e-9nt-1th z3xti,bqe*2wv rznb(v b)ut 4 i+86tzb*3vmrthout having any initial rotation when she lea+u84e)(*mz6wbvv z2 rbt3rt* bnqvbives 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
