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Homework Help: Velocity of water

  1. Dec 13, 2007 #1


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    1. The problem statement, all variables and given/known data

    Water is in laminar flow, in a horizontal pipe 2.5 cm in radius. The pressure drop in a 20m section of the pipe is 3000Pa. The viscosity of the water is 1.2 x 10^-3 N *s/m^3. Calculate the velocity of the water along the axis of the pipe.

    2. Relevant equations

    The Bernoulli equation

    3. The attempt at a solution

    I attempted to apply the Bernoulli equation to this problem, but am not sure what to do with the viscosity of water. Every answer I have come up with is not correct.

    How does the viscosity fit into this problem (if at all).
  2. jcsd
  3. Dec 13, 2007 #2


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    Homework Helper

    Aren't you forgetting about the energy lost to friction added to Bernoulli's equation?
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