[填空题]
A rotating merry-go-round makes one com-.nrwmc a18giaz9pk;9fx q4t0rc j(y pa7 u+-s0cv j4yd a;qlzlete revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a child seated 1.2 m 0u+vj7d-cszq ; al4 ayfrom the center? $m/s$
(b) What is her acceleration (give components)? $m/s^2$ the center