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A 120-cm-thick layer of oil floats on a 130-cm-thick layer of water.

What is the pressure at the bottom layer?
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The density of water = 1000 kg/m�,
so the pressure under 1.30m of water = 1.30 m x 1000 kg/m� x 9.81 m/s�
which is = 12753 Pa

The pressure under 1.20 m of oil with a density = 900 kg/m� is,
1.20 m x 900 kg/m� x 9.81 m/s� = 10596 Pa

Adding these two pressures from two layers of liquid,
the total GAGE pressure at the bottom of water layer would be:
Pgage = 12753 + 10596 = 23349 Pa ANS
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