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Engineering question about angle?

  1. Aug 25, 2009 #1
    Engineering question about angle??

    1. The problem statement, all variables and given/known data

    Determine the angle (theta) for connecting member 1 to the plate soo that the resultant force of F1 and F2 is directed horizontally to the right. Also, what is the magnitude of the resultant force?
    i drew a sketch diagram up in paint to help me but it did not. here is what i made.


    2. Relevant equations
    i know you will have to use some trig like cos and sin
    also maybe law of cos



    3. The attempt at a solution

    i did the sketch also i tried braking down the both the F1 and the F2 into x and y components but got stuck on the x and y components for the F1 because i get for
    x= 8 cos (90 - theta)
    any help would be great.
    thanks
     

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  3. Aug 25, 2009 #2

    Doc Al

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    Staff: Mentor

    Re: Engineering question about angle??

    So far, so good. Keep going. (Note that you can also express that x-component using sinθ.)
     
  4. Aug 25, 2009 #3
    Re: Engineering question about angle??

    sin θ = Fr/8 where Fr is the resultant force. but that is 2 unknowns and i dont know what to do from there. i dont have the text book for this class, the book store ran out or i would just look in there for examples.
     
  5. Aug 26, 2009 #4

    Doc Al

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    Staff: Mentor

    Re: Engineering question about angle??

    One step at a time. You haven't gotten to the resultant force yet. You're still finding the x-component of F1: F1x = 8 sinθ. Now find F1y, F2x, and F2y.
     
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