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29. A tank full of water has the shape of a paraboloid of revolu- tion as shown in the figure; that is, its shape is

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29. A tank full of water has the shape of a paraboloid of revolu- tion as shown in the figure; that is, its shape is obtained by rotating a parabola about a vertical axis. (a) If its height is 4 ft and the radius at the top is 4 ft, find the work required to pump the water out of the tank

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