What power does a person develop when lifting a bucket of water weighing 120N from a well 20 m deep in 15 seconds?

Given:

P = 120 Newton – the weight of a bucket of water that a person lifts;

h = 20 meters – well depth;

t = 15 seconds – the time it takes for a person to raise water from a well.

It is required to determine W (Watt) – the power developed by a person.

Since the condition of the problem is not specified, we believe that a person raises water evenly, that is, at a constant speed. Then, to determine the power, you need to use the following formula:

W = A / t = F * h / t = P * h / t = 120 * 20/15 = 120 * 4/3 = 40 * 4 = 160 watts.

Answer: the power developed by a person is 160 watts.