[填空题]
A rotating merry-go-round makes one),1ra4va ve h v.neytr2,de3b.ruw 0j complete revolution in 4.0 s (z )b+lcm*zhtzd5a,3c Fig. 8–38). (a) Whatd)b*c, hz t caz3z+m5l 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