4) Water enters a tank of diameter Dr= 40 cm steadily at a mass flow rate of 5 kg/min. An orifice at the bottom with diameter D. - 4 cm allows water to escape. The orifice has a rounded entrance, so the frictional losses are negligible. If the tank is initially empty, a) determine the rate of mass accumulation in the tank as a function of time. b) determine the maximum height that the water can reach in the tank