Question

An engine can pump 20000litres of water to a vertical height of 30 m in 10 minutes. Calculate the work done by the engine and its power also. (Take g =10 m/s square, density of water=1000 kg m /s cube and 1000 litres of water occupy a volume of 1 m cube.)

Answer 1

H=30m
T=10min=600s
Volume of the water lifted =20000L
=20000/1000=20m^3
Mass=volume ×dencity
=20×1000
=20000kg
Work done by engine =mgh
=20000×9.8×30
=....
..J calculation do yrslf

Answer 2

Answer:

given,

h=30metre

t=10 minute =10×60=600sec

g=10m/s^2

Explanation:

mass=density×volume

= 1000×1

=1000 kg

mass of 20000 litre water=20000kg

Then,

work done=PE=mgh

=20000×10×30

=6×10^6 joule

Power=work done/time taken

=6×10^6/600

=10000 watt