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Homework Help: Perpendicular 3Dimensional Vectors

  1. Sep 15, 2005 #1
    How would you go about finding a perpendicular vector, to two 3 dimensional vectors? One way, I solved is using the cross product of the two vectors. Splitting the i's j's and k's up and solving using a determinent. But, what's another way to do it?
     
  2. jcsd
  3. Sep 16, 2005 #2
    Find the normal to the plane that contains the two vectors?
     
  4. Sep 16, 2005 #3

    Tom Mattson

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    That's the same thing.

    You did it "the easy way", which is how I would have done it. "The hard way" would be to find a vector whose dot product with each of the first two vectors vanishes. Pure silliness, that route.
     
  5. Sep 16, 2005 #4
    Worded differently, might have given him a different idea? :confused:
     
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