An open truck moves with a uniform velocity on a frictionless horizontal surface.Rain falls into the truck with negligible speed of 45kg/min.To keep the truck in uniform speed,
6N horizontal force is needed to apply to it.Find the uniform speed of the truck.
pysicics question(general mechanic)
2007-10-27 3:29 am
回答 (1)
2007-10-27 6:12 am
✔ 最佳答案
m=mass, v=velocityForce(F) = d/dt (mv)=m dv/dt + v dm/dt
so 6 = 0 + v * 45/60...as dv/dt = 0
v=8 ms-1
the uniform speed of the truck is 8 ms-1
參考: My Physical knowledge
收錄日期: 2021-04-23 21:13:17
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