[填空题]
A rotating merry-go-roundrc1fl-/i 5+w cde g*qh makesm:fo-6kp l 5mkji+*z/ece kb* one complete revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a child seated 1.2 m from the centkekb*f: ocl -m5/z*+ijk 6pemer? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center