Question: Air flows isentropically through a variable - area duct. At section 1 , A 1 = 2 3 cm 2 , p 1 = 3

Air flows isentropically through a variable-area duct. At section 1, A1=23 cm2, p1=320 kPa, 1=1.75 kg/m3, and Ma1=0.25. At section 2, the area is exactly the same, but the flow is much faster.
Determine the sonic throat area.

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