Question: What must the back pressure be in Prob. 17-83 for a normal shock to occur at a location where the cross-sectional area is twice the

What must the back pressure be in Prob. 17-83 for a normal shock to occur at a location where the cross-sectional area is twice the throat area?
Prob. 17-83
Air enters a converging-diverging nozzle with low velocity at 2.0 MPa and 1008C. If the exit area of the nozzle is 3.5 times the throat area, what must the back pressure be to produce a normal shock at the exit plane of the nozzle?

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