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Physics homework vectors, magnitude and direction

  1. Sep 3, 2009 #1
    1. The problem statement, all variables and given/known data

    Three forces are applied to an object. Force F1 has a magnitude of 23.0 newtons (23.0 N) and is directed 30.0° to the left of the +y axis. Force F2 has a magnitude of 14.0 N and points along the +x axis. What must be the magnitude and direction (specified by the angle θ in the drawing) of the third force F3 such that the vector sum of the three forces is 0 N?


    2. Relevant equations



    3. The attempt at a solution

    i have no idea where to even start..please help me!
     
  2. jcsd
  3. Sep 3, 2009 #2

    kuruman

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    Do you know how to resolve vectors into components? If, "yes", do it and make sure that all x-components together add to zero and all the y-components together add to zero. If "no", you should learn that first before attempting this problem.
     
  4. Sep 3, 2009 #3
    ok so for x it was +14 and for y it was -23-x.so i did the square root of (-23-x)^2 +14^2
    resulting in -27 N. but that is the wrong answer
     
  5. Sep 3, 2009 #4

    kuruman

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    I cannot understand what "it" is that was +14 for x or -23-x for y. Let me see two separate equations, one below the other. Equation 1 should say that the sum of all the x-components is zero and Equation 2 should say that the sum of all the y-components is zero.
     
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