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Homework Help: Determine the direction of vector

  1. Sep 20, 2012 #1
    Find the direction of the vector . Let the direction of a vector be the angle that the vector makes with the +x-axis, measured counterclockwise from that axis. x=7.25 km, y=-3.50 km

    Please help. I got -25.769, but when I entered it (to the correct sig figs) mastering physics said it was wrong.
  2. jcsd
  3. Sep 20, 2012 #2
    Have you tried entering 360 - 25.769 = 334.231?
  4. Sep 20, 2012 #3
    That worked, thank you so much. But why did it have to be subtracted from 360?
  5. Sep 20, 2012 #4
    Do they want the answer in degrees?
  6. Sep 20, 2012 #5
    Yes, but it I got the answer. It had to be subtracted from 360. Thank you anyway.
  7. Sep 20, 2012 #6
    If the y component is negative and the x component is positive, in what quadrant will it be?
    Draw a sketch if you don't see it.
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