12.22 .. A closed container is partially filled with water. Initially the air above the water is at atmospheric pressure 11.01 * 105 Pa2 and the gauge pressure at the bottom of the water is 2500 Pa. Then additional air is pumped in increasing the pressure of the air above the water by 1500 Pa. (a) What is the gauge pressure at the bottom of the water? (b) By how much must the water level in the container be reduced by drawing some water out through a valve at the bottom of the container to return the gauge pressure at the bottom of the water to its original value of 2500 Pa? The pressure of the air above the water is maintained at 1500 Pa above atmospheric pressure.

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Question source: “University Physics with Modern Physics by Hugh Young and Roger Freedman

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