Question

Sand is being dropped from a stationary dropper at a rate of 0.5 kgs^–1 on a conveyor belt moving with a velocity of 5 ms^–1. The power needed to keep belt moving with the same velocity will be :

(A) 1.25 W

(B) 2.5 W

(C) 6.25 W

(D) 12.5 W

Answer 1

Correct option is (D) 12.5 W

Thrust = λV_rel

= 2.5 N

Now, Power = F × V = 12.5 W