Sand drops from a stationary hopper at the rate of 5 kgs- onto a conveyor belt moving with constant speed of 2 m/s What is the force required to keep the belt moving and what is the power
delivered by the motor moving the belt? (impulse J = Ft=my)
a) 10 N 20 W
b) 20 N, 10 W
c) 10 N, 10 W
d) 20 N,20 W
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