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Question

# A sheet of water passing over a waterfall is thicker near the top than near the bottom. Similarly, a stream of water emerging from a water faucet becomes narrower as it falls. Explain.

Solution

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As the water falls, it speeds up. The amount of water that passes a given point in a given time is the same at any height. If the thickness of the water stayed the same and its speed increased, the amount of water per time will increase. Hence, the thickness of the water must decrease to offset the increase in speed.

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