Work Energy and Power - Result Question 41
44. How much water, a pump of $2 kW$ can raise in one minute to a height of $10 m$, take $g=10$ $m / s^{2}$ ?
[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) $P=\frac{W}{t}$. Here, $P=2 kW=2000 W$. $W=Mgh=M \times 10 \times 10=100 M$ and $t=60 s$.
This gives, $M=1200 kg$
Its volume $=1200$ litre as 1 litre of water contains $1 kg$ of its mass.
