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Work question

  1. Oct 19, 2006 #1
    I can't solve this problem, please help me.

    How long will it take a 1780 W motor to lift a 252 kg piano to a sixth-story window 15.8 m above?
    what do i have to do?
  2. jcsd
  3. Oct 19, 2006 #2


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    Homework Helper

    What is the definition of power? Write it down and I'm sure you'll make progress.

    Edit: you may find this useful: http://www.glenbrook.k12.il.us/gbssci/phys/CLass/energy/u5l1e.html.
    Last edited: Oct 19, 2006
  4. Oct 19, 2006 #3
    you mean p=W/t?
  5. Oct 19, 2006 #4


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    Homework Helper

    Yes, I mean P = W / t. Now, what does the work equal?
  6. Oct 19, 2006 #5
    yes, i find it thanks
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