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Stokes law

  1. Feb 1, 2009 #1
    Hello all.

    I'm investigating a little bit about stokes law in order to understand the settling velocity of falling particles and on the net i encountered with 2 different formulas and i simply can't find the reason why they are different. every formula gives me a different answer.
    The 2 formulas are :
    1. Vt=gd^2(Pp-Pm)/18u - stokes_law_terminal_velocity.png
    2. V=2/9*d^2*g*(Pp-Pm)/u - 3dbef61d20c1951c09a727ff8d4a809c.png

    Any idea why they are different ?
    Thanks.
     
    Last edited: Feb 1, 2009
  2. jcsd
  3. Feb 1, 2009 #2
  4. Feb 2, 2009 #3
    Silly me, i knew it's something stupid.
    Thanks :)
     
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