[问答题]
Can the diver of Fig. 8–29 k,lbks3 gny04 do a somerj1dpurn)4x:o,i uo*n bf c+n /sault without having any initial rotation when shei p*+4d:1r uconnn/jb)o f,xu 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.
