1. The problem statement, all variables and given/known data Find the potential of a fluid whose density varies with height according to this relation: ρ = a (H-z2) + 1.5 kg/m3 being H=20m, 15m <= z <= 20m, Mtotal= 200kg. The fluid is inside a cylinder of radius = 2m and height = 5m. 2. Relevant equations Bernoulli equation? 3. The attempt at a solution I seriously have no idea how to solve it since the density varies, I'm not good with fluids problems :D I've attached the image of the problem.