Air flows in a constant-area, insulated duct. The air enters the duct at (520{ }^{circ} mathrm{R}, 50

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Air flows in a constant-area, insulated duct. The air enters the duct at \(520{ }^{\circ} \mathrm{R}, 50 \mathrm{psia}\), and \(\mathrm{Ma}=0.45\). At a downstream location, the Mach number is one. Find:

(a) The pressure and temperature at the downstream location

(b) The change in specific entropy

(c) The frictional force if the duct is circular and \(1 \mathrm{ft}\) in diameter.

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