This $3-$foot wide rectangular gate located at the bottom of the reservoir is pinned at its center A

and is prevented from rotating about the axis through A by the block B$.$ Water weighs $62\mathrm{.}4$

$l\frac{b}{f}{t}^3.$

Determine the total force of the water against the gate.

Determine the reactions at A and $B.$

Since the gate works by having a motor or mechanical device apply a moment to the gate's axis

through $A,$ what is the magnitude of the moment that must be applied to start the rotation of the

gate?

Note: the design of this gate is that regardless of the depth of the water, the force of the water

will tend to close the gate. It is very probable that the gate will not be free to rorate, and the

mechanism used to open it must also be used to close it$.$