Question

a pump is required to lift 800 kg of water per minute from a well 14 m deep and eject it with a speedof 18.0m/s how much work is done per minute in lifting the water​

Answer 1

Work done = energy to lift water + energy imparted to eject it with given velocity


Energy to lift water = change in PE

PE = mgh

m = 800kg
g = 10m/s^2
h = 14 m

PE = 800*10*14
= 112000 joules


Energy required to impart velocity = KE of water

KE = 1/2mv^2
= 1/2*800*18^2
= 129600joules

Total work done = 241600joules

Answer 2

Explanation:

Energy to lift water = change in PE

PE = mgh

m = 800kg

g=10m/s^2

h = 14 m

PE = 800*10*14 = 112000 joules

Energy required to impart velocity =

KE of water

KE = 1/2mv^2

= 1/2*800*18^2 = 129600joules

Total work done = 241600joules