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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?

Respuesta :

MrRoyal

Answer:

[tex]Power = 2.5kW[/tex]

Explanation:

Given

[tex]Mass = 200kg[/tex] -- mass of tub

[tex]Energy = 200,000J[/tex]

[tex]Time = 80s[/tex]

Required

Determine the amount of power needed

Power is calculated as thus:

[tex]Power = \frac{Energy}{Time}[/tex]

Substitute values for Energy and Time

[tex]Power = \frac{200,000J}{80s}[/tex]

[tex]Power = 2500W[/tex]

Divide by 1000 to convert to kW (kilowatt)

[tex]Power = 2.5kW[/tex]

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