[填空题]
A rotating merry-go-rouh+j4zn u+oh*bl/ dqk+:vok s)p;xk* tnd q5zb;fz9 l djrx-b9 ;kmakes one complete revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a chilbz;x-99q;lb5 jk r zdfd seated 1.2 m from the center? $m/s$
(b) What is her acceleration (give components)? $m/s^2$ the center
