[填空题]
A rotating merry-go-round ma2vu ;tbb vg7eg lgb)3x3 5(guakes one complete revolution in 4.0 s (Fig. 8–38).zv1 1p1u3x muyjr+fk *eqg68u (a) What is the linear speed of a child seated 1.2 u+1rf*6 exz qjp1kmv1 uug83ym from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center