Question

Question 3

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

`Power = 2.5kW`

Step-by-step explanation:

Given

`Mass = 200kg` -- mass of tub

`Energy = 200,000J`

`Time = 80s`

Required

Determine the amount of power needed

Power is calculated as thus:

`Power = (Energy)/(Time)`

Substitute values for Energy and Time

`Power = (200,000J)/(80s)`

`Power = 2500W`

Divide by 1000 to convert to kW (kilowatt)

`Power = 2.5kW`