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How long would it take a 7.5 kW motor to raise a 500 kg piano to an apartment window 1000 meters above the ground?
Wiki User
∙ 13y ago
The motor provides energy at the rate of 7500 Joules each second.
The energy needed to raise the piano = mass of the piano x acceleration due to gravity x height = 500 x 9.81 x 1000 = 4.905 x 106 Joules
time taken = 4.905 x 106 / 7500 = 654 seconds
So, it would take around 11 minutes.
Wiki User
∙ 13y ago
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