Underground water is pumped to a sufficient height through a 10-cm diameter pipe that consists of a 2-mlong vertical and 1-m-long horizontal section. water discharges to atmospheric air at an average velocity of 3 m/s, and the mass of the horizontal pipe section when filled with water is 12 kg per meter length. the pipe is anchored on the ground by a concrete base. determine the bending moment acting at the base of the pipe (point a) and the required length of the horizontal section that would make the moment at point a zero.