Question

A pump discharges 500kg of water per minute through a long into a tank 20m above the tank. What is the useful work done by the pump in 1hr?

Answer 1

The formula of work is as follows :

Work = Force × Distance

Given mass = 500 kg we can get the force.

Force = 500 × 10 = 5000 N

This is force in Newtons.

We have :

5000 N per minute

In one minute the work done is:

5000 × 20 = 100000 Joules

We need work done in one hour.

In one hour the work done is :

100000 × 60 = 6000000 Joules

We can make this smaller by converting to kilo joule's.

1000 joule's = 1 kilo joule

6000000/1000 = 6000

= 6000 Kilo Joules