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Homework Help: Vector question

  1. Mar 26, 2009 #1
    1. Find a.b given the following information

    two vectors a.b are perpendicular to eachother


    3. |a| = 3
    a = squareroot of 3,

    if B is a vector perpendicular to a,
    dunno what to do from here,

    quick response please
  2. jcsd
  3. Mar 26, 2009 #2


    User Avatar
    Gold Member

    What are you asking for?
  4. Mar 26, 2009 #3
    the a.b,

    the dot product
  5. Mar 26, 2009 #4


    Staff: Mentor

    One definition for the dot product is
    a [itex]\cdot[/itex] b = |a||b| cos([itex]\theta[/itex])
    where [itex]\theta[/itex] is the angle between the vectors.
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