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How long will it take a 1930 W motor to lift a 285 kg piano to a sixth-story window 16.0 m above?

2007-11-14 13:07:33 · 1 answers · asked by Kevin J 1 in Science & Mathematics ➔ Physics

1 answers

Potential energy gained equal to wokk done against the gravity
E=Pe=mgh

Power is rate of energy flow
P=E/t

E=Pe=mgh

t= E/P= mgh/P
t=285 x 9.81 x 16/ 1930
t= 23.2 s

2007-11-14 13:37:25 · answer #1 · answered by Edward 7 · 0⤊ 0⤋

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