[填空题]
A rotating merry-go-ri rbh3-7tq:n:r1 yd.ne kni)zound makes onuywj,0d h0bv 4e complete revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a chyuw0j0, hv4b dild seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center