First slide

Power

Question

Sand is falling on a conveyor belt at the rate of $5 k g s^{- 1}$ . The extra power required to move the belt with a velocity of $4 m s^{- 1}$ is,

Easy

A

30 W
B

80 W
C

150 W
D

1.2 W

Solution

$P = \frac{d m}{d t} V^{2} = 5 \times 4 \times 4 = 80 w$

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