a bearing wall carries a dead load of 120kn/m and live load of 100 kn/m. It is to be supported on a 400mm deep continuous footing underlain by a medium sand (unit weight = 19.2 kn/m3, phi= 37 deg, effective c = 0). The groundwater table is at great depth. Compute the minimum footing width required to maintain a factor of safety of at least 2.0 against a bearing capacity failure.