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Homework Help: Find the magnitude and the angle that it makes with the positive x-axis?

  1. Sep 10, 2011 #1
    1. The problem statement, all variables and given/known data
    find the magnitude and the angle that it makes with the positive x-axis?
    http://imageshack.us/photo/my-images/594/unledzmo.png/


    2. Relevant equations



    3. The attempt at a solution
    The answer that I have is
    F= 179.37 at an angle of 91 degrees. Am I right?
    I took F1 and multiplied that by <cos60,sin60>, F2 multiplied that by <cos135,sin135>,F3 multiplied by <cos270,sin270> and then I added up all those vectors. then I used the Pythagorean theorem to get the magnitude then I took the inverse cosign of the x component of the resulting vector divided by the magnitude to get 91 degrees.
     
  2. jcsd
  3. Sep 10, 2011 #2

    vela

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    That's what I got too. Good work!
     
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