A sign is hung by two chains from mast AB. The mast is hinged at a and is supported by cable BC knowing that the tensions in chains DE and FH are 225N and 135N respectively and that D equals 0.39m.?

To analyze the forces acting on the mast AB, we can use the equilibrium conditions for static structures. The tensions in chains DE (225 N) and FH (135 N) create moments about the hinge point A, and the distances involved, such as D (0.39 m), will affect the resultant forces. To ensure equilibrium, the sum of the moments around point A must equal zero, allowing us to determine the necessary support reactions at point C. Further calculations would be needed to find specific angles and resultant forces acting on the mast.