1. The problem statement, all variables and given/known data A beam has a solid square cross section of 100mm and is simply supported by two supports 3m apart. Calculate the dead load that can be safely supported when applied to the middle of the beam. 2. Relevant equations Solid square cross section of beam: 100mm Material: unknown Distance between two beams: 3m Assumption: material is reinforced concrete weight of material: 24KN/m3 Area of square = height x width volume = area of solid x length dead load = volume x unit weight of material 3. The attempt at a solution area of square = 100mm x 100mm = 10,000mm2 (0.0100m2) volume = 0.0100m2 x 3m = 0.0300m3 dead load = 0.0300m3 x 24KN/m3 = 0.72KNVm3 ∴ dead load = 0.72KNVm3 / m3 = 720N Can someone please tell me where I am going wrong with this as I have been advised this is wrong but I dont know where. Thanks in advance for your help.