[填空题]
A rotating merry-go-roundn9omewt9q 2x; j.tw/.rp.x e .e(x rqvmax;. 3 7e ehxj w,7)mlzehf-7l0baud makes one complete revolution in 4.0 s (Fig. 8–38). (a)bam07h x.w ajmhul e -;3lzx 7deef,7) What 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