Nitrogen is stored in a tank at temperature 20 C and absolute pressure 300 kPa. The tank is fitted with a converging nozzle ending with a cross-sectional diameter d= 1 cm, and open to atmospheric pressure 100 kPa. If the nitrogen flow is isentropic and nitrogen ratio of heat capacities k = 1.4 and dry nitrogen gas constant R = 296.8 J/kg.K, (a) Determine whether the nozzle is choked or unchoked. (b) Find the critical temperature of the flow. (c) Find the mass flower rate. Question No. 2 Answer: 10 mm