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Homework Help: Can somebody help me get started on this problem?

  1. Feb 4, 2008 #1
    vector b = (89.9)x + (-43.8)y

    what is the direction of b in radians counter clockwise from the positive x - axis.

    i already solved for the unknown side, but i don't understand how i solve this with the information given? any help would greatly appreciated.
     
  2. jcsd
  3. Feb 4, 2008 #2
    sorry mods, please move to coursework help.
     
  4. Feb 4, 2008 #3
    Setup a trig ratio to find the angle in radians...
     
  5. Feb 4, 2008 #4
    so, do i do:

    360 * tan ^-1 (43.8/89.9)

    i'm not sure what do about counter clockwise thanks.
     
    Last edited: Feb 4, 2008
  6. Feb 4, 2008 #5

    mezarashi

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    Homework Helper

    The counter-clockwise means that if the angle opens below the positive x-axis, then it is considered positive.
     
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