hello all! I am new to this forum. I am doing Mechanic of Solid ( summer course). I have come across with this problem , but I don't know how to solve it. I have attached the question. Could anyone help me? I don't know how to convert from density to force. in this questions given are weight of concrete= 25 kN/m^3 Height of the water contained by the dam= 3.3 m density of water= 1000 kg/m^3 Stresses at A and B=? In order to find out stresss, I need to know forces. This is where I get stuck! Thank you very much!