Question

What is the power of a pump which takes 10 seconds to lift 200 kg of of water to a a water tank situated at a height of 20 ? ( Take g = 9.8 ms^-2)
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Answer 1

Answer:

$P = 3920$ $W$.

Explanation:

Power can be defined as the rate of doing work.

$W = mgh$

⇒  $P = \frac{mgh}{t}$

Remember to check whether the quantities are in their S.I Units.

m = 200 kg

g = 9.8 $m / s^{2}$

h = 20 m

t = 10 seconds

Substitute these values in the formula.

$P = \frac{(200)(9.8)(20)}{(10)}$

$P = 3920$ $W$.

Answer 2

Answer

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