习题18-3 解:火车的固有长度为l=300m火车速度为v=100(km.h-)=250/9(m.s)

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例1一飞轮半径为0.2m、转速为150rmin-1,因 受制动而均匀减速,经30s停止转动.试求:(1) 角加速度和在此时间内飞轮所转的圈数;(2)制动开 始后t=6s时飞轮的角速度;(3)t=6s时飞轮边缘 上一点的线速度、切向加速度和法向加速度

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4.1写出下列信号对应于s平面的复频率。 (1)e-sin(-5t) (2)3e-e(t) (3)cos 2t (4)2e-cos(2t+60°)

1. The branch of accounting which aims at serving external users is called 2. a credit entry decreases asset and accounts or increases liability owner's equity, and revenue accounts

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An introduction to Western Social Theory e l.The significance of studying western social theory e1. 1 The developing tendency of social science =1. 2 The sociology's researching target 3.1.3 The independence of sociology