$[5$ marks$]$ For the horizontal T through which water is flowing, find the $y-$component of the external force $($denoted as $F_y)$ in $N,$ acting through the bolts to hold the $T$ in place. Show clearly the control volume used.

Data including additional information: $Q_1=0\mathrm{.}25\frac{m^3}{s},Q_2=0\mathrm{.}10\frac{m^3}{s},p_1=100$kPa,$p_2=70$kPa, $p_{3a}=80$kPa,$D_1=15cm,D_2=7cm$ and $D_3=15cm.$