Water drains by gravity out of the bottom of a large tank, through a horizontal 1 cm ID tube, 5 m long, that has a venturi meter mounted in the middle of the tube. The level in the tank is 4 ft above...

Water drains by gravity out of the bottom of a large tank, through a horizontal 1 cm ID tube, 5 m long, that has a venturi meter mounted in the middle of the tube. The level in the tank is 4 ft above the tube, and a single open vertical tube is attached to the throat of the venturi. What is the smallest diameter of the venturi throat for which no air will be sucked through the tube attached to the throat? What is the flow rate of the water under this condition?