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?

a) 5,000,000 W
b) 5,000 W
c) 50 J
d) 12,500 W

Answer 1

12500W

Step-by-step 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 =
`(work done)/(time )`

insert the parameters and solve;

Power =
`(250000)/(20)` = 12500W