[问答题]
Can the diver of Fig. num3.lo m /1(m n5pjxh8–29 dvhtwld9;3l/ 4p a l/ietd;:v ko a somersault without having any initial rotation when sad ldlvtp9v: k l e;/itwh3;4/he 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.
Post time 2025-2-18 20:00:22
