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OpenStudy (anonymous):
I don't understand what this question is asking me to do. "How long would it take a 7.50kW motor to raise a 500kg piano to an apartment window 10 meters above the ground?"
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OpenStudy (anonymous):
First find the work needed, which is the change in potential energy, W = m g h. The find how long it takes, the work divided by the power time = W(in J)/ (7500 J/s)
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