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Momentums, Ladder against a wall force

  1. Mar 6, 2012 #1
    1. The problem statement, all variables and given/known data

    http://www.physics.ox.ac.uk/olympiad/Downloads/PastPapers/BPhO_PC_2008_QP.pdf

    Question 6

    2. Relevant equations

    Moment = Force * Distance moved

    3. The attempt at a solution

    I have tried this and I am sorry to say that I have no idea how to work it out. I think it is something to do with moments but the centre of gravity is not about a pivot so I don't if I should still reference Y from W. Furthermore, since the exact location of W is not known, I can't just use pythagoras to find the distance of Y from W.

    Any help would be great, thank you very much.
     
  2. jcsd
  3. Mar 7, 2012 #2

    tiny-tim

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    Science Advisor
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    Hi Mukilab! :smile:
    uhh? :confused: The question tells you to take moments about Y.

    Get on with it!
    Read the question … it's a "uniform ladder", meaning that it's the same all the way along

    so W will be in the middle! :wink:
     
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