Continuity: A shower head has $20$ circular openings, each with radius $1\mathrm{.}0$ mm$.$ The shower head is

connected to a pipe with radius $0\mathrm{.}80$ cm$.$ If the speed of water in the pipe is $3\mathrm{.}0$ m$/$s$,$ what is its speed as

it exits the shower head openings?

IV$.$ Oil flowing through a pipeline passes point A at $2\mathrm{.}50$ m$/$s with gauge pressure $180$ kPa. At point B$,5\mathrm{.}0$ m

below point A$,$ the flow speed is $1\mathrm{.}50$ m$/$s$.$ What is the gauge pressure at point B$.$