[填空题]
A rotating merry-go-round makes one compleg nklyw.b,+)i*f pm-ote revols qjymulgv;1fe( u(tr2r78a7ution in 4.0 s (Fig. 8–38). (a) ytfuqu7 ;e8ajv lrmg 2s((71rWhat 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