Linear supersonic theory predicts that the curve of wave drag versus Mach number has a minimum point

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Linear supersonic theory predicts that the curve of wave drag versus Mach number has a minimum point at a certain value of \(M_{\infty}>1\).

a. Calculate this value of \(M_{\infty}\).

b. Does it make physical sense for the wave drag to have a minimum value at some supersonic value of \(M_{\infty}\) above 1? Explain. What does this say about the validity of linear theory for certain Mach number ranges?

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