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Help with Combining Oblique Vectors

  1. Feb 8, 2012 #1
    1. The problem statement, all variables and given/known data
    R = 3.5N[350] Q = 2.75N[125] S = 2.15N[0]

    R + Q - S

    3. The attempt at a solution

    Finding x and y for 3.5N[350]
    Sin80 = y/3.5 = -3.45
    Cos80 = x/3.5 = 0.61

    y = -3.45
    x = 0.61

    Finding x and y for 2.75N[125]
    Sin35 = x/2.75 = -1.58
    Cos35 = y/2.75 = 2.25

    x = -1.58
    y = 2.25

    Finding x and y for 2.15[0]
    x = 0
    y = 0
    (Since it's at 0)

    Rx = 0.61 - 1.58
    Rx = -0.97

    Ry = -3.45 + 2.25
    Ry = -1.2

    a^2+b^2 = c^2
    c=1.54

    Tanθ=0.97/1.2
    θ=39°

    When I check the answer, it shows 1.67[99.68°] instead of my answer 1.54[39°].

    What did I do wrong?
     
  2. jcsd
  3. Feb 8, 2012 #2
    Solved it...forgot that 2.15[0] had a x..which is 2.15.
     
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