A long, solid cylinder of radius $1.2$ $m$ hinged at point $A$ is used as an automatic gate, as shown in the figure below. When the water level reaches $15$ $m$, the cylindrical gate opens by turning about the hinge at point $A$. Determine:

1. The hydrostatic force acting on the cylinder and its line of action when the gate opens
2. The weight of the cylinder per $m$ length of the cylinder.

$F=$ $N$ $W=$ $kg/m$