Water vapor with specific heat ratio 1.3 expands in a small resistojet nozzle from initial conditions 1000 K and 10 MPa. The overall pressure ratio is 300. Frictional and heat transfer effects are negligible in the converging part of the nozzle, but in the remainder the polytropic index is 1.2, and the exit stagnation temperature is 728 K. Estimate the specific impulse, the required area ratio, and the mass flow rate for a thrust of 1 N with operation in a vacuum.
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