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Sea-level air is being drawn isentropically through a duct into a vacuum tank. The cross-sectional areas...

Sea-level air is being drawn isentropically through a duct into a vacuum tank. The cross-sectional areas of the duct at the mouth, throat, and entrance to the vacuum tank are 2 msquared, I msquared, and 4 msquared, respectively. What is the maximum mass flow rate of air that can be drawn into the vacuum tank?

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