What normal force must be applied at the vertex of the gate to open it?

International Edition---engineering Mechanics: Statics, 4th Edition
4th Edition
ISBN:9781305501607
Author:Andrew Pytel And Jaan Kiusalaas
Publisher:Andrew Pytel And Jaan Kiusalaas
Chapter8: Centroids And Distributed Loads
Section: Chapter Questions
Problem 8.113P: Calculate the resultant force caused by the water acting on the parabolic arch dam. The water levels...
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Note: Please state what formula you are using. And please be clear and detailed with your solution. Atleast explain. It will help me, thanks.

Problem: A Triangular gate having a horizontal base of 1.30 m and an altitude of 2 m is inclined 45o from the vertical with vertex pointing upward. The base of the gate is 2.70 m below the surface of oil (s = 0.80). What normal force must be applied at the vertex of the gate to open it? Show figure

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