[填空题]
A rotating merry-go-round makes onc)i6gii/fqsoscv +h ) d/e+v(njw+ i.e complete revolution ik. l-2tjez he:/yr:/f(assbd n 4.0 s (Fig. 8–38). (a) What is the linear speed of a child seated 1.2 m from tf(/ rss-j:.eeazh/ k2 :dlty bhe center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center