Pressure in a Liquid: As shown in the figure, a large open tank contains a layer of oil (density 450 kg/m3) floating on top of a layer of water (density 1000 kg/m3) that is 3.0 m thick, as shown in the sketch. What must be the thickness of the oil layer if the gauge pressure at the bottom of the tank is to be 8.5 × 104 Pa?
Fill in the blank(s) with the appropriate word(s).
13 m
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