[问答题]
Can the diver of Fig. 8–29 do als-uwt2(e.vaq8/ a 3bie z2 mz so 9p6k)q;nzg bl p,v9m1ssws. umersault without having any initial rotation when she leaves the boapk sb);mn, 6qw1ul.9z sv sg9prd?
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
