[填空题]
A rotating merry-go-round makes o9zo-dtz:1;(gohlna ia5 j d5pne complete revolution in 4.0 s (Fig. 8–38)qxn3-jps+393 tb9 nhey)gtv m. (a) What is the linear speed of a child seated 1.bethv9st3yn q jm-n+9p3 3) xg2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center