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Homework Help: HELP easy algebra vector question please!

  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
    Last edited: Mar 26, 2009
  2. jcsd
  3. Mar 26, 2009 #2
    You want the dot product of two vectors that are perpendicular to each other?

    What is the cosine of a right angle?

    Does that give you any ideas?
  4. Mar 26, 2009 #3


    User Avatar
    Science Advisor

    This doesn't make any sense. First you say the magnitude of the vector is 3, then you say it equals the square root of three?

    Also, I see no question. (Might be the dot product as Dr.D suggests but I don't see it)
  5. Mar 27, 2009 #4


    Staff: Mentor

    Please don't post the same problem in two different forums. You also posted this in the Calculus and Beyond forum.
  6. Mar 27, 2009 #5


    User Avatar
    Science Advisor

    One important application of "dot product" is determining if two vectors are perpendicular. Do you remember how?
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