刚体的转动习题课选讲例题 物理学教程 (第二版) 求(2)t=5s时角速度及转过的圈数; a =0.8rad.s-2 w=at=4rad/s 1 0 0=-at2 =10rad n= =1.6 2π 求(3)t=1s时轮缘上一点的加速度. r=0.5m a:=a=0.4m-s2 a @at =0.8rad.s-1 an ro2 0.32m.s-2 a d=ya+ap =0.51m.s2 B=arctan(an/a)=38.7 二音风木转员第三章 刚体转动 物理学教程 刚体的转动习题课选讲例题 (第二版) = t = 4rad s 1.6 2π = = n 2 t 0.4m s − a = a = 2 2 n 0.32m s − a = r = 10rad 2 1 2 = t = 1 0.8rad s − =t = 求(2) t = 5s 时角速度及转过的圈数; 2 0.8rad s − = 求(3) t =1s 时轮缘上一点的加速度. r = 0.5m 2 2 n 2 t 0.51m s − a = a + a = = arctan(an at ) = 38.7 a r n a at a