Laws Of Motion Question 295

Question: Sand is being dropped on a conveyor belt at the rate ofM kg/s . The force (in N) necessary to keep the belt moving with a constant velocity of v m/s will be:

Options:

A) Math input error

B) 2 Mv

C) Math input error

D) Math input error

Show Answer

Answer:

Correct Answer: A

Solution:

[a] F=d(Mv)dt=Mdvdt+vdMdt

v is constant,

F=vdMdt But dMdt=Mkg/s

F=vM newton.



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