Air flows adiabatically between two sections in a constant area pipe. At upstream section (1), \(p_{0,1}=100 \mathrm{psia}, T_{0,1}=600^{\circ} \mathrm{R}\), and \(\mathrm{Ma}_{1}=0.5\). At downstream section (2), the flow is choked. Estimate the magnitude of the force per unit cross-sectional area exerted by the inside wall of the pipe on the fluid between sections (1) and (2).