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A reservoir dam holds an 8 km2 lake behind it. Just behind the dam, the lake is 6.5m deep. What is the gauge pressure a...

A reservoir dam holds an 8 km2 lake behind it. Just behind the dam, the lake is 6.5m deep. What is the gauge pressure at the base of the dam (in Pascals)?

Also, What is the absolute pressure at a point 1.0 m down from the surface? Assume the pressure at the surface is one atmosphere.
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