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Question: a tank filled with oil is in the shape of...

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A tank filled with oil is in the shape of a downward-pointing cone with its vertical axis perpendicular to ground level. (See a picture of the tank here.) The height of the tank is h -8 feet, the circular top of the tank has radius r4 feet, and that the oil inside the tank weighs 55 pounds per cubic foot. How much work (W) would it take to pump oil from the tank to the level at the top of the tank if the tank were completely full? ft lb

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