Question

An electric pump has 2kW power. How much water will the pump lift every minute to a height of 10 m ? ​

Answer 1

Given:-

power=2kW=2000W

h=10m

t=1 min=60 sec

g=10 m/s^2

$power = \frac{work \: done}{time}$

$2000 = \frac{work \: done}{60}$

$work \: done = 2000 \times 60 - - (1)$

and,

$work \: done = mgh - - (2)$

by eq. 1 and 2

$2000 \times 60 = m \times 10 \times 10$

$m = 60 \times 20$

$m = 1200 \: kg$

so, 1200 kg of water pump every min