[SOLVED] Fluids and Forces Hi, I'm new to this site, so I'm not sure if this is the right place to post. I found a year-old entry with the same question that I'm having trouble with, found here: https://www.physicsforums.com/showthread.php?t=153538 For Part a, I followed the same method that PremedBeauty followed, but can't seen to get the correct answer. Is there a force that I am missing? For Part b, I integrated to try and find the total force, but, once again, my answer comes out incorrect. My calculations for part b are below. F=force (atm)= atmospheric pressure (in Pascals) p= density of water g=gravity h= depth of water dh= change in depth of water A= area = width*h D = depth (as defined by problem) F=((atm) + pgh)*A But because pressure changes with depth, we must integrate dF = ((atm) + pgh) * (width*dh) Integrating yields: F= (atm)(width)(h) + (.5)(p)(g)(h^2) evaluated from 2D to 3D Evaulating yields: F= 3D^2((atm) + 1/5pgD) - 2D^2((atm) + pgD) The answer that I get from this calculation does not agree with the correct answer; is there something I am missing?