Q.

Sand is being dropped on a conveyor belt at the rate  of M kg/s. The force necessary to keep the belt moving with a constant velocity of  v m/s will be

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a

Mν newton

b

2Mν newton

c

mν2 newton

d

zero

answer is A.

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Detailed Solution

Force required, F=d(mv)dt=vdmdt=vMAs velocity  is constant, henceMν newton
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Sand is being dropped on a conveyor belt at the rate  of M kg/s. The force necessary to keep the belt moving with a constant velocity of  v m/s will be