A concrete dam with a triangular cross section (Figure) is built to hold 30 ft of water. D...

A concrete dam with a triangular cross section (Figure) is built to hold 30 ft of water. Determine the hydrostatic force on a unit length of the dam and its location. Also, if the specific gravity of concrete is 2.67, what is the moment generated with respect to the toe of the dam, A? Is the dam safe?

Figure