$7\mathrm{.}6$ A test setup to determine the energy loss as water flows through a valve is shown in Fig. P$7\mathrm{.}6.$ Calculate the energy loss if $0\mathrm{.}10f\frac{t^3}{s}$ of water at $40F$ is flowing. Also calculate the resistance coefficient $K$ if the energy loss is expressed as $K(\frac{v^2}{2}g).$