Question: Gas flows through a converging– diverging duct. At point A'' the cross-section area is 50[ cm 2 ] and the Mach number was measured to

Gas flows through a converging– diverging duct. At point "A'' the cross-section area is $50[$ $cm 2$ ] and the Mach number was measured to be 0.4. At point B in the duct the cross-section area is 40 [ $cm 2$ ]. Find the Mach number at point B. Assume that the flow is isentropic and the gas specific heat ratio is 1.4.

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