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Water at the bottom of a lake exerts a pressure of 4.9 x 10⁶ N/m² due to the water column alone. Find the depth of the lake.

1. 500 m
2. 400 m
3. 300 m
4. 200 m

Correct answer: 500 m

Solution

Gauge pressure from a fluid column depends only on depth, density and g, not on the shape of the lake.

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