Water $($sg $=1\mathrm{.}0)$ flows from a tank to the atmosphere through a convergent$-$divergent mouthpiece. The minimum diameter and absolute pressure head at point $2$ are $0\mathrm{.}06$ m and $2\mathrm{.}5$ m $,$ respectively. The exit from the tank is rounded so that head loss can be neglected. If the atmospheric pressure head is $11$ m and h is $1\mathrm{.}9$ m $,$ estimate discharge, diameter at the exit $($point $3),$ and new discharge when the divergent part of the mouthpiece is removed.