Question

How much water, a pump of 2 kW can raise in one
minute to a height of 10 m, take g = 10 m/s²?
(a) 1000 litres (b) 1200 litres
(c) 100 litres (d) 2000 litres

Answer 1

Answer:

How much water, a pump of 2 kW can raise in one

minute to a height of 10 m, take g = 10 m/s²?

(a) 1000 litres

(b) 1200 litres

(c) 100 litre

(d) 2000 litres

Answer 2

work done = power × time

thus

work done by pump in one minute = 2kW× 60 sec

= 2000×60= 120000 joule

as water is lifted to 10 m

therefore , work done to lift the water = mgh

=m×10×10

=100m

work done by pump = work done to lift the water

120000=100m

1200 kg = m

and mass = volume x density

1200kg = 1000 kg/m3 ×volume

volume= 1.2 m^3

volume = 1200 litres. (as 1m^3= 1000 litres)