[问答题]
Can the diver of Fig. 8–29 do a somersault without having any ;9)p- tlipimj ew+u;vinitial rotation wl 9jvp;+ uiwpte);i-mu63 .s-omuyw. a rqeipj6//tzhen sh.quj swi3 a-6.erotyz/p / m6ue 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.
