Q.

Sand is falling on a conveyor belt at the rate of 5kgs-1. The extra power required to move the belt with a veloctiy of 6ms-1 is,

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a

30 W

b

180 W

c

150 W

d

1.2 W

answer is B.

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Detailed Solution

F = Additional force to be applied on the belt = vreldmdtvrel = Velocity of sand relative to the belt along its direction..: F = 6 x 5 N = 30 N.: Extra power = FV = 30 x 6 watt = 180 Watt
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