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Moments - Principle of moments question

  1. Feb 9, 2009 #1
    physicshomework1.jpg


    I am trying to determine force X

    I know it is the principle of moments so I think you use this equarion - not sure though:

    In equilibrium
    (the sum of)anticlockwise moments = (the sum of) clockwise moments

    however I am not sure how to do it?

    thanks for any help!
     
  2. jcsd
  3. Feb 9, 2009 #2

    tiny-tim

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    Welcome to PF!

    Hi Jambob28! Welcome to PF! :wink:

    Hint: you need to take moments about a point

    the question asks you where the third horizontal force is

    which point do you think you should take moments about? :smile:
     
  4. Feb 9, 2009 #3
    Hi thanks for your help.

    I am guessing the other arrow would be at the same level as arrow B but right instead of left?
    So
    B Y
    <-----------|||||----------->

    I really am pretty useless so i'm probably wrong.
     
  5. Feb 9, 2009 #4

    tiny-tim

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    hmm … look at the first diagram …

    where is the third place where a force can be exerted? :smile:
     
  6. Feb 9, 2009 #5
    well I guess you could pull it the other way?

    so:
    Y <-------------|||-----------> Pull
     
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