[填空题]
A rotating merry-go-round makeid.6bg ,i w;xahm s:ncw /((jqs one compl jo0n9y*q 6zug 7wyba:ete revolution in 4.0 s (Fig. 8–38). (a) Whgzja6y :y97 ow0b u*qnat 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