A converging nozzle with an exit area of 0.05 m^2 is connected to a reservoir containing air with a stagnation pressure of 600 kPa and a stagnation temperature of 27 C (celsius). Find the exit plane pressure, the exit plane Mach number, and the mass flow rate for the back pressures of 400 kPa, 200 kPa, and 100 kPa.