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Vector Cross Product

  1. Apr 9, 2008 #1
    If vectors V_1 and V_2 are perpendicular, lV_1 x V_2l =? I know that if they are parallel for vector cross product, they equal 0.
     
  2. jcsd
  3. Apr 9, 2008 #2

    mathman

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    The cross product is a vector perpendicular to V_1 and V_2. Also V_1 and V_2 don't have to be perpendicular to each other, only not parallel.

    Note that this only makes sense in 3 dimensional space.

    Further note: the magnitude is |V_1|x|V_2|cos(a), where a is the angle between the vectors. There is a sign ambiguity.
     
    Last edited: Apr 9, 2008
  4. Apr 9, 2008 #3

    ehj

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    Isn't it |V_1|*|V_2|*sin(a)?
     
  5. Apr 9, 2008 #4

    mathman

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    You're right - my bad.
     
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