3. water at 20 0c flows into a pressurized tank at a rate of 4 m3/s as shown in figure. water is discharged from the tank into the open atmosphere from two ports. the connection to the ports is 0.5 m below the water surface in the tank, the 250 mm diameter port discharges 0.6 m above the connection and the 400 mm diameter port discharges 0.7 m below the connection. what air pressure is required to keep the system at steady state? (ans: 253 kpa)