partment echanics Final Exam 1) A farmer is to pump water at 20C from a river to a water storage tank nearby using a 38 m long, 0.13 m diameter plastic pipe with three flanged 90 smooth bends. The water velocity near the river surface is 1.8 m/s, and the pipe inlet is placed in the river normal to the flow direction of water to take advantage of the dynamic pressure. The elevation difference between the river and the free surface of the tank is 3.66 m. For a flow rate of 2.5 m/min and an overall pump efficiency of 70 percent, determine the required electric power input to the pump. (The density and dynamic viscosity of water at 20C are p 998 kg/m3 and - 1.002103 kg/(mxs). The roughness of galvanized iron pipe is = 1.510-4, standard flanged 90 smooth elbows (KL = 0.3 each), and a sharp-edged exit (KL = 1.0)). (40 p.) = River 0.13 m 38 m 3.66 m 2.5 m/min Water lank Air