# physics

How long will it take a 1879W motor to lift a 309kg piano to a window 15.4m above? what is the equation?

here are my givens

P= 1879 w
m= 309 kg
h= 15.4 m
t= ? s

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1. well, how many joules of work to get it up?
Potential energy rise = m g h
= 309 * 9.81 * 15.4 Joules
that is the power times the time.
= 1879 * time in seconds

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