Question

A pump Efis water from a lake to a large tank: 20 m schove the lake. How much work against gravity does the pump do as it transfers 5.0 m² of water to the tank? One cubic meter of water has a mass of 1000 kg.

Answer 1

$A=mgh=\rho Vgh=1000\cdot5\cdot 10\cdot 20=1~MJ.$