Question

A crane used 250,000 Joules of work to move a beam to the top of a building in 20 seconds. How much power did the crane use?

Answer 1

Answer:

12500W

Explanation:

Given parameters:

Work done  = 250000J

Time taken  = 20s

Unknown:

Power of the crane = ?

Solution:

Power is the defined as the rate at which work is being done;

  Mathematically;

        Power = $\frac{work done}{time }$

 insert the parameters and solve;

      Power  = $\frac{250000}{20}$   = 12500W