Question: Air flows in a 15-cm-diameter horizontal pipe. At section 1, (p=600 mathrm{kPa}, T=70{ }^{circ} mathrm{C}), and (V=35 mathrm{~m} / mathrm{s}). At section 2: (T=42^{circ} mathrm{C})

Air flows in a 15-cm-diameter horizontal pipe. At section 1, $p=600 \mathrm{kPa}, T=70{ }^{\circ} \mathrm{C}$, and $V=35 \mathrm{~m} / \mathrm{s}$. At section 2: $T=42^{\circ} \mathrm{C}$ and $V=115 \mathrm{~m} / \mathrm{s}$. Determine

(a) The pressure at section 2

(b) The total friction force on the pipe wall

(c) The heat transfer

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