You fill a vertical glass tube to a depth of 15.0 cm with freshwater. You then pour on top of the water an additional 15.0 cm of gasoline (density 7.40 * 10^2 kg/m3), which does not mix with water. The upper surface of the gasoline is exposed to the air. Find the gauge pressure (a) at the interface between the gasoline and water and (b) at the bottom of the tube.

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You fill a vertical glass tube to a depth of 15.0 cm with freshwater.
You then pour on top of the water an additional 15.0 cm of gasoline
(density 7.40 * 10^2 kg/m3), which does not mix with water. The upper surface
of the gasoline is exposed to the air. Find the gauge pressure (a) at the
interface between the gasoline and water and (b) at the bottom of the tube.

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