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Homework Help: Equilibrium of rigid bodies

  1. Nov 17, 2013 #1
    1. The problem statement, all variables and given/known data
    Determine the reaction at C.

    2. Relevant equations

    3. The attempt at a solution
    i know i have to take the moment about line DB
    and thus resulting in

    ƩM(DB)= λ(DA X F) + λ(DC X RC) =0

    where λ = DB/ DB

    however the book solved it differently. they instead do the following.

    λ(BA XF) + λ(DC X RC)
    where λ is BD/BD. My question is, why did they do BA cross F and not DA cross F, like i did? or are both ways correct.

    I did it my way and i got RC= 48j
    and the book's answer is RC= 45.4 j

    can someone please clarify this for me? thank you so much

    Attached Files:

  2. jcsd
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