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Finding Tensions (3 strings and 1 mass)

  1. Nov 17, 2012 #1
    1. The problem statement, all variables and given/known data

    In the picture, what are the tensions in strings 1, 2, and 3?

    http://www.flickr.com/photos/90172232@N04/8194075362/

    2. Relevant equations



    3. The attempt at a solution

    I know string 3 is obviously 200N. I forget how to solve for the other strings. Do I add vectors here? string 1 = ?*sin(70) perhaps. Can somebody just point me in the right direction with this?
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Nov 17, 2012 #2

    haruspex

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    At the junction, you have some forces acting. There is no acceleration. Draw a free-body diagram for the junction and write out equations representing the lack of acceleration.
     
  4. Nov 17, 2012 #3

    tiny-tim

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    Welcome to PF!

    Hi Prima! Welcome to PF! :smile:

    Start by giving things names

    call the tensions T1 and T2.​

    Then write the equations for components in the x and y directions. :wink:

    (alternatively, draw a vector triangle)
     
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