The piston shown in Fig. P3.39 is forcing \(70{ }^{\circ} \mathrm{F}\) water out the exit at \(12 \mathrm{ft} / \mathrm{sec}\). The exit pressure has been measured as \(p_{e}=40 \mathrm{psig}\). Determine the force on the piston for a piston diameter \(D_{p}=3.0 \mathrm{in}\).

Figure P3.39

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F V = 2 ft/sec P. = 40 psig h = 8.5 ft g 100