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Homework Help: Moments, trusses

  1. May 15, 2009 #1
    1. The problem statement, all variables and given/known data


    2. Relevant equations
    p1=800#, p2= 600# and a=8, determine a reaction load

    3. The attempt at a solution
    sum Ma=0=-4.5p1-6p2+12.5cy
    I am generally lost, this isn't homework its practice for the final exam. Could someone help?
  2. jcsd
  3. May 15, 2009 #2


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    Science Advisor
    Homework Helper
    Gold Member

    You've got it right. From your equation, you can solve for Cy. Then use sum of forces in x direction = 0, and sum of forces in y direction = 0, to solve for Ax and Ay. Note that Cx must be zero, since it is a roller support that is free to slide in the x direction, and thus, can support no load in that direction.
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