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Q.

An engine pumps up 100kg of water through a height of 10m in 5s. Given that the efficiency of the engine is 60%, what is the power of the engine? (g=10 ms−2)

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a

0.033 Kw

b

3.3 kW

c

0.33 kW

d

33 Kw

answer is B.

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Detailed Solution

Efficiency(η)=output powerinput power=(mgh/t)P

⇒P=10060mght=100×100×10×1060×5=3.3×103 W

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