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Defining angles in radians

  1. Sep 9, 2008 #1
    1. The problem statement, all variables and given/known data
    quick question...im given the arc length ( 1m ) and the radius ( 1.5m ).......to find the angle between the two vectors....do i just plug into angle=S/R???


    2. Relevant equations

    angle = S / R

    3. The attempt at a solution
    1/1.5= 0.67
     
  2. jcsd
  3. Sep 9, 2008 #2

    Defennder

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    Angle between two vectors? If this is for an arc of a circle, then it is applicable. But if it is the angle between two vectors you should be using the dot product.
     
  4. Sep 9, 2008 #3
    im assuming its for arc of a circle because im not given any points what so ever...and i am given an arc length. thanks alot man
     
  5. Sep 10, 2008 #4

    Defennder

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    Problem is, as I said earlier you can only use that formula on if you are certain that the vectors can be placed on some circle such that their lengths (magnitude) are the same. Otherwise it won't work. What is the original question?
     
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