4. (20 points) A pressurized tank of water has a 10-cm-diameter orifice at the bottom, where water discharges to the atmosphere. The water level is 2.5 m above the outlet. The tank air pressure above the water level is 250 kPa (absolute) while the atmosphere pressure is 100 kPa. Neglecting frictional effects, determine the initial volume discharge rate of water from the tank. Air 250 kPa 10 cm 2.5 m