[填空题]
A rotating merry-go-round makes one complete revom k)3nj 6go 2o6tg*uspk 5yza4lution in zjfe8b(o(*g i4.0 s (Fig. 8–38). (a) What is the linear speed of a chi((fg e oji8zb*ld seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center