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The components of vector are given as follows

  1. Jan 14, 2012 #1
    1. The problem statement, all variables and given/known data

    The components of vector are given as follows
    Ax= +3.9
    Ay= -4

    The angle measured counterclockwise from the x-axis to vector , in degrees, is closest to:

    A,136





    B.134





    C.224





    D.314





    E.46


    2. Relevant equations



    3. The attempt at a solution

    When I saw this problem I though all we had to do was get the inverse tan of -3.9/4

    Which gave me -44.27. I added 180 to place it in the proper quadrent to get 135.7 which is choice A however the answer is 314 which makes no sense
     
  2. jcsd
  3. Jan 14, 2012 #2

    Doc Al

    User Avatar

    Staff: Mentor

    What quadrant do you think it should be in?
     
  4. Jan 14, 2012 #3
    fourth which is why you would add 360 and not 180.. Thank you!
     
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