A gate is designed to open when the water surface reaches a distance of 0.800 m above the top of the gate. The face of the gate that is acted upon by the water pressure is a rectangle with width 1130 mm and height 1030 mm. Determine: The resultant, FR, of the force exerted by the water on the gate. The distance, Lp-Lc, from the centroid of the rectangle to the centre of pressure The magnitude of the weight, W, required so that the gate begins to open when the water surface is a distance of 0.800 m above the top of the gate. FR: Lp-Lc: W: III KN mm KN Mark Mark Mark 0.800 m (5 marks) (5 marks) (5 marks) Hinge 215 mm 1030 mm 1130 mm