Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

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


    User Avatar
    Homework Helper

    Your work is correct. I get the same result.
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook