[问答题]
Can the diver of Fig. 8–29 do a somers4 c0uzq n u(kl:,tcxw, q90obb7pt1sb.yo 0r *valb7h ault without having any initial rotation when she lea.tlr 1v7o0b7pby s*h 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.
