Static equilibrium 3D, traffic light problem

  • Thread starter J-dizzal
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Homework Statement


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


Homework Equations


Sum of all forces and moments =0

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
[/B]


Edit: solved by finding magnitude of M
 
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Answers and Replies

  • #2
Dr. Courtney
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You have two components of the moment vector. Compute the magnitude of the vector.
 
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