Register to reply

Power to life a piano question

by netone
Tags: life, piano, power
Share this thread:
May5-12, 05:14 PM
P: 6
Power to lift* a piano

A piano of mass 200 kg is lifted vertically by a 0.5 hp motor. Given that 746 watt = 1 hp,
how long will it take the motor to lift the piano to an apartment that is 20 m above the

Not really sure how to start this question, so any explanation would be greatly appreciated.
Phys.Org News Partner Physics news on
Symphony of nanoplasmonic and optical resonators produces laser-like light emission
Do we live in a 2-D hologram? New Fermilab experiment will test the nature of the universe
Duality principle is 'safe and sound': Researchers clear up apparent violation of wave-particle duality
May5-12, 05:58 PM
P: 45
1 watt = 1 joule of energy / 1 second

And has you lift the piano you are doing work ( in Joules ) to raise the piano against the Earth's gravity so now you have a connection between time ( what you are looking for ) and the energy involved in lifting the piano.

A free body diagram might help you as well to visualize. (i.e. draw a picture including ALL of the forces acting on the piano). Have fun!
May5-12, 06:03 PM
P: 6
ooh ok, I didn't realize that 1 watt = 1 joule per second, that helped out quite a bit. Thanks so much for the response!

Register to reply

Related Discussions
Real life power supplies Electrical Engineering 7
Half-Life real life application question Introductory Physics Homework 0
Calculating battery power life per charge over a given distance Engineering, Comp Sci, & Technology Homework 0
Help please, power (piano pulled up by workers through pulley) Introductory Physics Homework 1
Piano question General Discussion 9