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Static equilibrium 3D, traffic light problem

  1. Jul 7, 2015 #1
    1. The problem statement, all variables and given/known data
    The vertical and horizontal poles at the traffic-light assembly are erected first. Determine the additional force and moment reactions at the base O caused by the addition of the three 100-lb traffic signals B, C, and D. Report your answers as a force magnitude and a moment magnitude.
    20150707_094447_zpssusqwms9.jpg

    2. Relevant equations
    Sum of all forces and moments =0

    3. The attempt at a solution
    I got the Force at O right, but the moments im not sure how to sum them
    20150707_130922_zpsvmghdnjk.jpg



    Edit: solved by finding magnitude of M
     
    Last edited: Jul 7, 2015
  2. jcsd
  3. Jul 7, 2015 #2
    You have two components of the moment vector. Compute the magnitude of the vector.
     
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