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Simultaneous equations help!

  1. Aug 8, 2011 #1
    Hey guys, im currently studying Engineering, and its only my first year. Im having trouble with one of the simultaneous equations i have made from a physics question. I dont know how to solve this because the uknowns are both angles.

    I have attached a photo of the simultaneous equation

    Thanks :)
     

    Attached Files:

  2. jcsd
  3. Aug 8, 2011 #2

    ehild

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    This is unsolvable. Show the original Physics question.

    ehild
     
  4. Aug 8, 2011 #3
    Thanks for the quick reply.

    I have attached the original physics question,

    the parameters were given to me online, which are

    Weight of A= 144N
    Weight of B = 229N
    weight of C = 202N
     

    Attached Files:

  5. Aug 8, 2011 #4

    ehild

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    The right side of your second equation in the previous post is not zero. The vertical components of the tensions in the strings must balance the weight of A.

    ehild
     
  6. Aug 8, 2011 #5
    Thank you so much Ehild for your help :), i completely missed that.
     
  7. Aug 8, 2011 #6

    ehild

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    Can you solve the problem now?

    ehild
     
  8. Aug 8, 2011 #7
    sadly not, I had high hopes, and gave it a shot. But i still dont know how to solve a simultaneous equation with the uknowns as the angles..
     
  9. Aug 9, 2011 #8

    ehild

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    It is always very useful to move the terms with different angles on the different sides of the equation, square both sides, then add up the equations, and replacing sin()2 +cos()2=1

    ehild
     
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