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Vectors in 3D

  1. Sep 3, 2014 #1
    1. The problem statement, all variables and given/known data
    Hibbler.ch2.p62.jpg

    Specify the coordinate direction angle α,β,γ of F1.
    2. Relevant equations



    3. The attempt at a solution

    γ= 90-30 = 60
    The only obvious one.

    I have no clue how I'm supposed to see what the other are. α seems to me like it's 320 degrees because if you rotate in the positive direction on the XY-plane then that's where you'll end up.

    To find the final angle I suppose I'm just supposed to use the equation with the cosine of all three angles squared.
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Sep 3, 2014 #2

    Simon Bridge

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    You need to start by clearly stating the definitions of the angles.
     
  4. Sep 3, 2014 #3

    LCKurtz

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    Hint 1: The components of a unit vector in a direction give the direction cosines.

    Hint 2: How are your given angles related to spherical coordinate angles?
     
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