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Mag and Direction of 3d Vectors

  1. Oct 12, 2009 #1
    1. The problem statement, all variables and given/known data
    Find the magnitude and direction of the following vectors.
    C = -2 i - 9 j + 4 k



    I found that the magnitude was 10. By using the square root of (4+9+4).

    I don't know how to find:
    Angle from +z-axis
    and the direction in xy plane counter clockwise from the +x axis.

    Thanks
     
  2. jcsd
  3. Oct 12, 2009 #2
    gamma=Az divided by A
     
  4. Oct 12, 2009 #3
    English please? is Az, 4k? Also, how do I find the direction in xy plane counter clockwise from the +x axis?
     
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