Question

How long must a 400 W electrical engine work in order to produce 3000 J of work?

Answer 1

7.5 seconds

Step-by-step explanation:

Required equation: Power = work done / time

Power = 400 W

Work done = 3000J

Time = ?

To find the time taken we need to rearrange the formula into:

Time = work done / power

This turns our formula into:

3000 ÷ 400 = 7.5 seconds

Meaning our answer is 7.5 seconds

Hope this helps have a lovely day :)