[填空题]
A rotating merry-go-round mak/f8/igm o ruxm7)h0-n0z pnlp es one complete revolution in 4.0 s sxavlx7t c705 (Fig. 8–38). (a) What is the linear speed of a child seated 1.2 m from t5axx v t707sclhe center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center