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Homework Help: Tension of a cable problem

  1. Sep 3, 2007 #1
    1. The problem statement, all variables and given/known data
    A 235lb sign is supported from a wall by a cable inclined 37 degrees with the horizontal, and a brace perpendicular to the wall. Find the tension in the cable and the compression in the boom.

    The answers are 390.5 and 311.9. But I have no idea how they got to those numbers. :S

    2. Relevant equations
    No idea?

    3. The attempt at a solution

    Tried to find the x/y components of the vectors, but i'm confused now.
  2. jcsd
  3. Sep 3, 2007 #2


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    One way is to draw a free body diagram of the sign and identify the forces acting on it ....its weight down, the cable tension along the length of the cable (which has an x and a y component), and the brace compression along its length (x component only). Then use Newton 1 inthe x and y direction to solve for the components.
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