Air flows adiabatically in a 3-cm-diameter duct with f = 0.015. At the entrance, V = 950

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Air flows adiabatically in a 3-cm-diameter duct with f = 0.015. At the entrance, V = 950 m/s and T = 250 K. How far down the tube will
(a) The Mach number be 1.8; and
(b) The flow be choked?
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