1. The problem statement, all variables and given/known data A miniature sub is lowered to a depth of 8.5 m in sea water of density 1.03 grams/cc. The interior of the research craft is maintained at 1.0 atm. Find the net force that must be withstood by a 1.5 m diameter hatch which leads to the inside. 2. Relevant equations Pressure = density * gravity * height Pressure = P (atmospheric) + density * gravity * height Mass = density * area* height 3. The attempt at a solution Pressure = 101300 + 1030 kg/m^3 (9.81m/s^2) * 8.5m Once I found the pressure, I multipied it by the area (pi r^2) The answer I got was wrong and I'm wondering what I did wrong. Please help.