[填空题]
A rotating merry-go-round makes one ch,5okfok mq6 y;v up(9g;*yo r6* ikxzh0xaa6 omplete revolution in 4 -whehe 95mjd).0 s (Fig. 8–38). (a) Whatwje5hm9-e hd) is the linear speed of a child seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center