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Velocity of fluid through a point on a plane

  1. Aug 20, 2012 #1
    1. The problem statement, all variables and given/known data

    Fluid flows with velocity 2i - 3j m/s at point P having coordinates (1,2,4). Consider a plane through P which is normal to the vector b=-i+2k. What is the speed at which the fluid passes through the plane?


    3. The attempt at a solution
    Should I do the dot product of the position vector P=[1,2,4] and b vector, then multiply this by unit vector that is in the direction of the b vector, and then dot the result with the velocity vector?

    thats what i did but im getting a negative velocity
     
    Last edited: Aug 20, 2012
  2. jcsd
  3. Aug 20, 2012 #2

    tiny-tim

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    hi racnna! :smile:
    but what is the relevance of the position vector? :confused:
     
  4. Aug 20, 2012 #3
    hmm...maybe i dont need it?? ok just ignore the position vector part...

    should i just find the dot product of v and a unit normal vector of the plane?
     
  5. Aug 20, 2012 #4

    tiny-tim

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