The width of the gate (the dimension into the page) is 3 m. Atmospheric pressure is patm =...

The width of the gate (the dimension into the page) is 3 m. Atmospheric pressure is patm = 1 × 105 Pa and the mass density of the water is ρ = 1000 kg/m3. Determine the horizontal force and couple exerted on the gate by its built-in support A.