[填空题]
A rotating merry-go-round makes one complete revos blub8z o d-k*/w*gk0lution in 4.0 s (Fig. 8–38).yseic;q/);pqogzsb:. lq)-u (a) What is the linear speed of a child seated 1.2 m fr;lg:s)s.cq/q-e bq o)izup y ;om the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center