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Homework Help: Tension on Wires

  1. Feb 27, 2008 #1
    1. The problem statement, all variables and given/known data

    A 75N bird feeder hangs from a vertical wire that is connected to two other upper wires that are attached to a horizontal support, as shown in the figure

    On a copy of the diagram, draw arrows to indicate the forces present in the wires


    By considering forces A, calculate the tension in the wire AB, which rests at an angle of 60 degrees to the horizontal.

    2. Relevant equations

    No equations given

    3. The attempt at a solution

    i did this


    75= Ab Sin 60

    The answer is 84.6 N

    but i dont think the answer is good.
  2. jcsd
  3. Feb 27, 2008 #2

    Doc Al

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    Staff: Mentor

    What about the tension in the other wire? You can't ignore it.
  4. Feb 7, 2010 #3
    84.6N is correct? I too am not sure how to do it even though the working must be something easy T.T
  5. Feb 7, 2010 #4

    Doc Al

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    Staff: Mentor

    No, it's not correct. To find the correct answer, apply the conditions for equilibrium.
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