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Determine the pressure and force at the bottom of a 1m diameter open tank if it contains layers of 20 cm of oil, 60

Determine the pressure and force at the bottom of a 1m diameter open tank if it contains layers of 20 cm of oil, 60 cm of water and 10 cm of mercury. Given that the densities of oil, water and mercury are 850 kg/m, 1000 kg/mand 13600 kg/m respectively. [Take g= 9.81 m/s]

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