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Homework Help: How to find the angle between F2 and the x axis?

  1. Sep 14, 2008 #1
    1. The problem statement, all variables and given/known data
    Find the angle between the x axis and the force F2, and the magnitude of the resultant force?

    2. Relevant equations
    The equation of the triangle:
    a(squared) = b(squared) + c(squared) - 2bc cos A

    3. The attempt at a solution
    What I did was that I said that since the angle between the f1 and the negative x-axis is 70 degrees. Then the angle with the +y axis should be 20 degrees, and therefore if we make the whole two forces as a triangle and solve using the cosine rule, we should get the value of the resultant force, but after wasting countless amounts of paper, I still haven't got a solution? Any help will be greatly appreciated!

    Attached Files:

  2. jcsd
  3. Sep 14, 2008 #2


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    Gold Member

    Was there any other information that you have left out? The angle could be anything without extra information.
  4. Sep 14, 2008 #3
    Nope that is all the information given!
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