[填空题]
A rotating merry-go-round hye7 3*vyrax(m01b niwx9b,nmakes one comple19i2 zyguzv*i / jms8ete revolution in 4.0 s (Fig. 8–38). (a) What isisjvi/y1 *g u 9ez82zm 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