[问答题]
Can the diver of Fig. 8–29 doujzzxrz2 241 i a somc9ay+rcjq2 l;,zx -gy,zwde+ersault without having any initial rotation when she leavesa jczz,; +yydw,e gq+xl9 r2c- 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
