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Sets of pulleys

  1. Nov 24, 2016 #1
    Repost since it was removed from double questions.
    1. The problem statement, all variables and given/known data

    Worker Sim Pulma Sheen uses a system of pulleys to lift a 5000 N box 2 meters while pulling on the rope with a force of 500 N. This means the worker had to pull how much rope from the pulley system?
    a) 0.2m. b) 2m c) 5m d) 10m e) 30m

    2. Relevant equations
    W = F*D?

    3. The attempt at a solution

    I tried to find the work of the obj then set it equal to the work done on the person (pulling) and devide by force to find distance, and got 20.... is this not the right equation?
     
  2. jcsd
  3. Nov 24, 2016 #2

    Doc Al

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    Staff: Mentor

    You are correct.
     
  4. Nov 24, 2016 #3
    what equation should I use then?
     
  5. Nov 24, 2016 #4

    Doc Al

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    Staff: Mentor

    Your analysis is correct as is. You used the correct equation. The correct answer is not among the choices--not your fault.

    Where did you get the problem?
     
  6. Nov 24, 2016 #5
    Oh haha, thought you mean Im am correct on not being correct. I got it from my physics teach for a home retake test on our quiz....
     
  7. Nov 24, 2016 #6

    Doc Al

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    Staff: Mentor

    Maybe you'll get extra credit for pointing out his error. :smile:
     
  8. Nov 24, 2016 #7
    I wish, it's hard to get in touch with him.
     
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