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Homework Help: Input work & Mechanical advantage.

  1. Dec 13, 2007 #1
    1. The problem statement, all variables and given/known data
    Stan raises a 1200 N piano a distance of 5.00 m with pulleys and pulls on 20 m of rope. What is input work and mechanical advantage?


    2. Relevant equations
    Wo=Wi
    MA=Fr/Fe


    3. The attempt at a solution
    I calculated output work as 1200N*5.00m=6.00*10^3 and my book says Wo=Wi; but the answer for input work is 6.80*10^3. I'm not sure what the resistance and effort forces would be. Any help would be appreciated!
     
  2. jcsd
  3. Dec 13, 2007 #2
    i figured out the work input; so the effort force=340N, which i was given in part b of the question. i just need help on the resistance force...
     
  4. Dec 13, 2007 #3
    welp. nevermind. i got it. resistance force=1200N duuuh.
     
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