a very large tank, closed from above and not open to the atmosphere, is partially filled with water. the pressure at the top surface of the water is kept at three times atmospheric pressure by constantly injecting pressurized air from above. water emerges from the tank through a circular nozzle that is located close to the base of the tank and is open to the atmosphere. at the instant when the water stands high above the nozzle, what is the water flow rate from the nozzle? the cross-sectional area of the nozzle is . g