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**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**

i already have the final answer and it is

2.57 square/feet

but i need the solution.... T_T.. help

**1. Homework Statement**

**2. Homework Equations**

**3. The Attempt at a Solution**