Work Energy and Power - Result Question 41

44. How much water, a pump of 2kW can raise in one minute to a height of 10m, take g=10 m/s2 ?

[1990]

(a) 1000 litres

(b) 1200 litres

(c) 100 litres

(d) 2000 litres

Topic 4: Collisions

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Answer:

Correct Answer: 44. (b)

Solution:

(b) P=Wt. Here, P=2kW=2000W. W=Mgh=M×10×10=100M and t=60s.

This gives, M=1200kg

Its volume =1200 litre as 1 litre of water contains 1kg of its mass.



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