Q2. The gate AB in a reservoir wall holds back a body of water as shown in Figure 1 below. The gate is square, has a mass of 300 kg and is hinged about a horizontal axis perpendicular to the page and passing through point A. Use p20 = 1000 kg/m and g =9.8 m/s. (a) Calculate the resultant force (magnitude, direction and location) on the gate due to water pressure. [10 marks] (b) Determine the force R at the point B required to keep the gate closed. [10 marks] Air 2m A 0.5m R Water 0.8m B 2.5m 30