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Power question

  1. Oct 24, 2005 #1
    I have a 300 kg piano being lifted at a steady speed from the ground to a hieght of 10 meters and the crane that is doing the lifting is providing 400 watts of power. How much time does it take to get the piano to the top.
    So far I have Power = work/Time
    so time is Work/ power , so, work is equal to mass X gravity X hieght
    so I have (300)(9.8)(10)/(400) = 73.5 sec....is this correct....any help would be nice. Thanks
  2. jcsd
  3. Oct 24, 2005 #2


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    Homework Helper

    For the information you have, it looks fine, although you'll want to check the significant digits.

    It is, of course, an underestimate - do you see why?
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