[问答题]
Can the diver of Fig. 8–29 do a somersault without hav5+;jkt fn fqk t/l5dg)ins w4x nmaadpdi74ckqn*4547 ig any initial rotation when snwnadiak4c574d44 xi s*p q 7mhe leaves 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.
