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Homework Help: Moment Equilibrium in terms of box weight

  1. Jul 5, 2017 #1
    1. The problem statement, all variables and given/known data

    The board shown below is being held in equilibrium in the vertical plane by three smooth rods at A, B, and C
    Determine the magnitudes of forces at A, B, and C in terms of the weight of the body, W.

    2. Relevant equations
    Moment = f*r

    Here's a diagram _m5b_assess_q4_image2.png
    3. The attempt at a solution
    I'm assuming the point of rotation is in the middle, at 'W'

    So, B will be 25mm away, pushing clockwise
    A, 10 mm away pushing clockwise
    C 20 mm away pushing CCW.

    I don't exactly get what they mean by 'In terms of the weight of the body 'W'" , because W is outside of the input section, and it only accepts numbers into the blank. Thank you.
  2. jcsd
  3. Jul 5, 2017 #2


    User Avatar

    Staff: Mentor

    The forces that must be applied at A, B, and C will depend upon the weight of the board, W. So presumably you are expected to answer in terms of some numerical value times W.
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