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[20 pts] 3. A cistern has the shape of a hemisphere of radius 5 feet with the circular part at the top. If the

[20 pts] 3. A cistern has the shape of a hemisphere of radius 5 feet with the circular part at the top. If the cistern is full of water, find the work needed to pump all of the water out to a point 4 feet above the top of the cistern.

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