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(3 points) A tank of diameter D is filled with water up to a height h above the bottom of the tank (Figure 3). At the bottom of the tank is a hole of diameter d. Assume that the water flows out of the hole with a laminar flow and that the difference in atmospheric pressure between the top and the bottom of the tank is negligible. Figure 3: A tank draining(c) If you no longer assume that the level in the tank is constant, but rather that the top of the water has a speed downwards as the tank drains, show that the speed of the water exiting the bottom of the tank is given by: 2gh (1-可) u= d4 D4 at an instant when the water lkevel in the tank is h.

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