The water in a 25-m-deep reservoir is kept inside by a 150-m-wide wall whose cross section is an equilateral triangle. Determine (a) the total force (hydrostatic + atmospheric) acting on the inner surface of the wall and its line of action and (b) the magnitude of the horizontal component of this force. Take Patm = 100 kPa.

Structural Analysis
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Author:KASSIMALI, Aslam.
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Chapter2: Loads On Structures
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The water in a 25-m-deep reservoir is kept inside
by a 150-m-wide wall whose cross section is an equilateral
triangle. Determine (a) the
total force (hydrostatic + atmospheric) acting on the
inner surface of the wall and its line of action and (b)
the magnitude of the horizontal component of this force.
Take Patm = 100 kPa.

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