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Homework Help: Power Problem regarding elavator

  1. Apr 8, 2015 #1
    1. The problem statement, all variables and given/known data
    An 255kg elevator which is 62.5% efficient climbs 52.5 meters in 25 seconds. What is the power required to do this.

    I'm just not sure how to incorporate efficiency in this.

    2. Relevant equations
    P= change in energy over change in time

    3. The attempt at a solution

    P= 255*9.81*52.5/25 Do I need to multiplay the numerator by 0.625? Could you please explain why or why not? Thanks in advance :)
  2. jcsd
  3. Apr 8, 2015 #2


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    Science Advisor

    Will a non ideal process (<100%) require more or less energy than an ideal process?
  4. Apr 8, 2015 #3
    More. would I have to multiplay it by 1.625 then?
  5. Apr 8, 2015 #4


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    Science Advisor

    No. 1/1.625 = 0.615 ≠ 0.625
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