[填空题]
A rotating merry-go-round makes onbjq qg q0f7/(ge complete revolution in 4.0 s c xtokiv27i+7bj96cf (Fig. 8–38). (a) What is the linear speed kj tf7vcboc+ 6ix97i2of a child seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center