[填空题]
A rotating merry-go-rs5 jsf+ yu+(-lo 6crdhound makes one complete revolution in 4.0 s (Fig. 8–38). (a-ujl r ofdy+ 65+(csshs k6d(w /idgdjptw e* utlk18/w..r.m) What is the linear speed of a child seated 1.2 m from the ce/ww /. (gmr 6ld.ukpj8*.td1tid wesknter? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center