$*8\mathrm{.}65$ Water flows from a large open tank through a sharp$-$edged entrance and into a galvanized iron pipe of length $100$ m and diameter $10$ mm $.$ The water exits the pipe as a free jet at a distance $h$ below the free surface of the tank. Plot a log$-$log graph of the flowrate, $Q,$ as a function of $h$ for $0\mathrm{.}1h10m.$

$8\mathrm{.}66$ Air flows through the mitered bend shown in Fig. P$8\mathrm{.}66$ at a rate of $5\mathrm{.}0$ cfs $.$ To help straighten the flow after the bend, a set of $0\mathrm{.}25-$in$.-$diameter drinking straws is placed in the pipe as shown.

Estimate the extra pressure drop between points $(1)$ and $(2)$ caused by these straws.

F I G U R E P$8\mathrm{.}66$