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Homework Help: Simple moments Can't do Urgent

  1. Mar 30, 2008 #1
    Simple moments !! Can't do !!! Urgent

    1. The problem statement, all variables and given/known data

    Determine the reactions at the smooth collar A, the rocker B and the shortlink CD.

    2. Relevant equations
    RC = Normal reaction at smooth collar A.
    RN = Normal reaction at rocker B.
    RD = Normal reaction at D.
    Moment at rocker B is given to be 4KN.
    All distance shown in the diagram(made in paint) are in meters.

    3. The attempt at a solution

    The equations I made are :-
    Taking moments at B...
    (RCsin45*10) + (2.5cos60*3) + (4) = (RCcos45*3) + (RD*3) + (2.5sin60*6)
    RCcos45 = RD + 2.5cos60
    RCsin45 + RN = 2.5sin60

    The answer I get is wrong after calculating. Where does the error lie?

    Attached Files:

  2. jcsd
  3. Apr 1, 2008 #2
    Need urgent help.
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