[填空题]
A rotating merry-go-rombaas39 0g,s z+s8 1j lcgyn/bund s 3rzwgi47k g15h 2-lvd6+tushla wz5- hoc 1umakes one complete revolution in 4.0 s (Fig. 8–38). (a) What is the linear speed of a child seated 1.2 m from the cente 5- osa1hizkrslv5g-z1guh+h3wu w4t2 d7 l6 cr? $m/s$ (b) What is her acceleration (give components)? $m/s^2$ the center