A) Gate AB in Fig. (4) is 6 m wide and weights 2 tons. It is hinged at B and rests against a smooth wall at A. Determine the water level h at which the gate will start to open. Water A H Water Fig. 4 6 m Water B B) Find the minimum value of Z for which the gate shown in Fig. (5) will rotates counterclockwise if the gate is (a) rectangular, 1.2 by 1.2 m; (b) triangular, 1.2 m base as axis of motion, height 1.2 m. 27.6 KPa Egy Gas Fig. 5