[填空题]
A rotating merry-go-rxdwu5dd-m5 k /;gqm*rlo0uo47ox*c) w4km21nk b io 26h pkazound makes one complete revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed 0oxawn21k*u 726bkmhc)o 4zpo4l oikof a child seated 1.2 m from the center? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center