题目内容

The acceleration of a bus is given by a（t） =α*t, where α = 1.2 m/s^3. If the bus’s velocity at time t = 1.0s is 5.0 m/s, what is its velocity at time t = 2.0 s（）

A. 6.8 m/s
B. 5.6 m/s
C. 4.5 m/s
D. 7.6 m/s
E. 8 m/s
F. 5 m/s

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Plane A is flying at 400 mph in the northeast direction relative to the earth. Plane B is flying at 500 mph in the north direction relative to the earth. What is the speed of Plane B as observed from

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设有一条单侧电源10 kV配电线路，在最大运行方式下末端三相短路电流为880A，线路所装设TA变比为400/5。配电线路L等值阻抗为长度为15km 。试求电流速断保护定值二次值为（）A ，可靠系数取为1

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