[填空题]
A rotating merry-go-r(i a 24o2j,ots yv0d/w1zrnwv oul54pg p6tmwxb( 7 qd8e;x lez+nd makes one complete revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed of aeez 7;+d8 m5ll 6txw (4bqxgpp child seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center