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Homework Help: Three strings and a weight, need tensions in strings

  1. Oct 22, 2009 #1
    1. The problem statement, all variables and given/known data
    You have three strings holding a 20kg weight, all tied to a ceiling above the weight, one centered right above the weight, the other two tied to the string at equal angles. What is the tension in each of the cables

    2. Relevant equations

    3. The attempt at a solution
    Tension 1 (x)= T1 cos theta
    Tension 1 (y)= -T1sin theta -n
    Tension 2 (x)= 0
    Tension 2 (y)=mg+T2-n
    Tension 3 (x)= -T3cos theta
    Tension 3 (y)= -T3sin theta -n
    I really dont know if this is right, and what in the world the angle would be, i need help. Thanks
  2. jcsd
  3. Oct 22, 2009 #2


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    Staff Emeritus
    Science Advisor
    Homework Helper

    For a problem like this, you need to:

    1. Draw a free body diagram , showing each force that acts on the weight.
    2. Set up separate Fnet=0 equations for the horizontal and vertical directions.

    Have you drawn the free body diagram ? If it's not easy to post the drawing, can you at least list all the forces acting on the weight?
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