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Time-evolution of a vector

  1. Dec 27, 2009 #1
    Hi all

    Say I have a time-dependent vector v. Lets say that I find

    [tex]
    \frac{d}{dt}\br{v} = \br{q}\times v \perp \br{v},
    [/tex]

    where q is a vector. Am I allowed to conclude that the vector v rotates around q as time evolves?
     
  2. jcsd
  3. Dec 27, 2009 #2
    Oh, I realized it now. It becomes clear when you make a drawing that the vector v really does rotate (precess) around q as time evolves.

    Thanks.
     
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