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**1. A tank with vertical walls, 2m wide and 2m long and 2.5m high, is filled with 4800 litres of water (density 1000 kg/m3) and 3200 litres of light oil (density 900 kg/m3). Calculate the magnitude and location of the resultant force on each of the vertical walls of the tank.**

**2. By doing some simple math the water goes up to 1.2 m of the tank and the oil continues further to a combined height of 2 m.**

I solve this kind of problems by taking dF= ρghwdh. For the oil I take the integral from 0 to 0.8 and for water i take the same integral from 0.8 to 2. Then I find the moment for the side with the same way and through that i find the position of the force.

I know the solution is right for a single fluid. But is this right for 2 or more fluids on top of each other?

I solve this kind of problems by taking dF= ρghwdh. For the oil I take the integral from 0 to 0.8 and for water i take the same integral from 0.8 to 2. Then I find the moment for the side with the same way and through that i find the position of the force.

I know the solution is right for a single fluid. But is this right for 2 or more fluids on top of each other?