Question

If a pump fill water at 37400 litre/he, then
a rectangular shaped cabinet at 18 mt
dength, 11 mit breadth and 17 dom height
how much time will be needed to fill the
e
pump ?​

Answer 1

Answer:

Power = energy /time.

a pump can raise 1000 litres of water per minute. hence, in 1 min, 1000 litres of water raise.

so, in 1 min, r of water raise = density

of water x volume

= 1000 kg/m³ x 1000 x 10^-3 m³ = 1000 kg

3

mass raise per minute of water = 1000 Kg

now, potential energy of 1000 kg of water

at height 45 m = mgh of water 4.5 x 105/60sec [ because 1min = = 60 sec, raise water at the height = 45 m]

1000 x 10 x 45 = 450000 J = 4.5 x 105 J So, energy of water per second = power

= 7500 W

Now, we know, 1 horse power = 746 W so, 7500 W power = 7500/746 Hp = 10.05 Hp