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As shown in the Video and in the figure below, water "bubbles up$"\backslash ($ h$\_\{2\}=9\backslash$mathrm$\{$in$\}\backslash ).$ above the exit of the vertical pipe attached to three horizontal pipe segments. The total length of the $1\mathrm{.}0-$in$.-$ diameter galvanized iron pipe between point $(1)$ and the exit is $21$ inches. Determine the pressure needed at point $(1)$ to produce this flow.

Assume $\backslash ($ h$\_\{3\}=14\backslash$mathrm$\{$in$\}\backslash ).$

$\backslash [$

p$\_\{1\}=$

$\backslash ]$