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Homework Help: 2qns truss and pulleys

  1. Nov 12, 2011 #1
    1. The problem statement, all variables and given/known data
    For the truss find the reactions at point A and B.
    For pulley, find the relation bet acc of A and block B.

    2. Relevant equations

    3. The attempt at a solution
    For the truss, take moments at B.
    F212 + NA12=F110
    NA=-2kN which is wrong. Where did I go wrong? ans is -4800N.

    For pulley,
    if A moves down by x, then top movable pulley move up by 0.5x which is the same for the bottom pulley. Block B must then move by dist x. Since disp a = disp b, acc a= acc b
    I do not know the actual answer.

    Attached Files:

  2. jcsd
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