A gate having the cross section shown in Fig. P2.52 closes an opening 5 ft wide and 4 ft...

A gate having the cross section shown in Fig. P2.52 closes an opening 5 ft wide and 4 ft high in a water reservoir. The gate weighs 400 lb, and its center of gravity is 1 ft to the left of AC and 2 ft above BC. Determine the horizontal reaction that is developed on the gate at C.