Problem $5$: $2\mathrm{.}31$ Determine $p$ between points A and B$.$ All fluids are at $20C.$

Problem $6$: $2\mathrm{.}35$ Water flows upward in a pipe slanted at $30.$ The mercury manometer reads $h=12cm.$ What is the pressure difference between points $(1)$ and $(2)$ in the pipe?

Problem $7$: $2\mathrm{.}39$ In Fig. P$2\mathrm{.}39$ the right leg of the manometer is open to the atmosphere. Find the gage pressure, in $Pa,$ in the air gap in the tank.

$1$