First slide

Power

Question

An engine pumps up 100 kg of water through a height of 10 m in 5 s. Given that, the efficiency of engine is 60%. If g = 10 ms^-2, the power of this engine is :

Easy

A

3.3 kw
B

0.33 kW
C

0.033 kw
D

33 kw

Solution

$Power of engine = \frac{mgh}{t} = \frac{(100) (10) (10)}{5 \times 0 .6} \approx 3300 W \approx 3 .3 kW$

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