# Bernoulli's Principle

#### lnbanzon

1. Homework Statement

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. Homework Equations

3. The Attempt at a Solution

2.57 square/feet

but i need the solution.... T_T.. help
1. Homework Statement

2. Homework Equations

3. The Attempt at a Solution

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#### rock.freak667

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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