A dam 15 m high holds the water in reservoir . For safety reasons , the water level is maintained at a height 3 m below the top of the dam. At best of the dam , engineers have installed a vertical door in the shape of an equilateral triangle with sides of length 3 m , calculate the total hydrostatic force on the door. your solution must be clear and complete. you must define clearly in words each of the variables used and indicate their meaning on a digram . the density of water is p = 1000 kg/mˆ3. and the acceleration due to gravity is g= 9.8 m/sˆ2.