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Bernoulli's Principle

  1. Oct 8, 2009 #1
    1. The problem statement, all variables and given/known data

    air is flowing horizontally at a speed of 100 mph through a duct 4 square feet in cross section. the duct gradually narrows down to a throat section. if a U-tube shows a difference in pressure between the throat and main sections of 7 inch of water, what is the cross sectional area of the throat? (assume that the air is incompressible and has a density of 0.002378 slug per cubic feet)
    2. Relevant equations



    3. The attempt at a solution
    i already have the final answer and it is

    2.57 square/feet

    but i need the solution.... T_T.. help
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. Oct 8, 2009 #2

    rock.freak667

    User Avatar
    Homework Helper

    For a horizontal pipe what is Bernoulli's equation reduced to?

    When you get that formula you can find the velocity leaving the throat section.

    Do you know the equation of continuity?
     
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