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Civil Engineering PE

Category - Hydraulics - Closed

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The pressure at the bottom of a 75-foot column of water with a cross-sectional area of 18 inches² is, approximately, which of the following?

9.1 psi
20.0 psi
32.5 psi
48.8 psi

Explanation

Answer: C - The gauge pressure that is equivalent to the static head of a 75-foot column of water is approximately 32.5 psi.
Solution: Pressure = Specific Weight x Pressure Head

Given Specific weight of water = 62.4 lb/ft³

Where Pressure head = 75 feet

Pressure = 62.4 lbs/ft³ x 75 ft x 1ft²/144 in²

= 32.5 psi

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