Air, at an absolute pressure of (60.0 mathrm{kPa}) and (27^{circ} mathrm{C}), enters a passage at (486 mathrm{~m}

Question:

Air, at an absolute pressure of $60.0 \mathrm{kPa}$ and $27^{\circ} \mathrm{C}$, enters a passage at $486 \mathrm{~m} / \mathrm{s}$, where $A=0.02 \mathrm{~m}^{2}$. At section (1) downstream, $p=78.8 \mathrm{kPa}$ absolute. Assuming isentropic flow, calculate the Mach number at section (2). Sketch the flow passage.