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Homework Help: Dot product with angle

  1. Apr 11, 2008 #1
    One vector has a length of 23 units and another a length of 12 units. If the scalar product of these two vectors is 113, what is the angle between the two vectors?

    A dot B = ABcos(theta)
    113 = 12*23*cos(theta)
    113/276= cos(theta)
    cos^(-1)113/276 = theta
    65.8 degrees or 66 degrees using sig figs = theta

    is this right?
  2. jcsd
  3. Apr 11, 2008 #2


    User Avatar

    yes yes
  4. Apr 12, 2008 #3
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