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Homework Help: Force exerted by water in a U-shaped tube

  1. Aug 27, 2011 #1
    1. The problem statement, all variables and given/known data
    In a U-shaped tube, water is flowing with velocity v. The flowing rate is u, and it's constant. What force does the water exert on the wall of the tube.


    2. Relevant equations

    F = dp/dt

    u = m/t

    3. The attempt at a solution
    The change in momentum is
    [itex] mv - (-mv)[/itex]

    or

    [itex] 2uv \Delta t[/itex]

    so

    [itex] F = 2uv[/itex]

    is this correct?
     
    Last edited: Aug 27, 2011
  2. jcsd
  3. Aug 27, 2011 #2

    vela

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    Yes, that's correct.
     
  4. Aug 27, 2011 #3
    Thanks a lot !:biggrin:
     
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