Air flows isentropically through a converging nozzle. At a section where the nozzle area is 0 013 ft2, the local pressure, temperature, and Mach number are 60 psia, 40 F, and 0.52, respectively. The back pressure is 30 psia. The Mach number at the throat, the mass flow rate, and the throat area are to be determined.

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To PO P = 30 psia -+--