Question

A craned moved a 200 kg hot tub from the ground to the top of the hotel, 10 stories above the ground, in 80 seconds. If the crane used 200,000 J of energy, how

much power did the crane need?

Answer 1

Given that,

Mass of a hot tub = 200 kg

A crane is moved from the ground to the top of the hotel, 10 stories above the ground, in 80 seconds.

Energy used = 200,000 J

To find,

The power the crane needed.

Solution,

Power needed is equal to energy used per unit time. It can be given by :

`P=(E)/(t)\\\\P=(200,000\ J)/(80\ s)\\\\P=2500\ W`

So, the required power is 2500 W.