[填空题]
A rotating merry-go- q1n-dp,;2y x jatq;flround makes one complete revolution in 4.0 s (Fig.:m+7v s7pgz3uo i 62bq /ejlxn j,cth0 8–38). (a) What is the linear ol6 tm ,j cixp0j327ze/n v+suqbgh:7 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