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77.Lifting a Submerged Cone
+10
A conical bucket of negligible mass has rim radius at its open top, tapers linearly to a closed point at its bottom, and has total height . It is held submerged in water of density with its rim a distance below the lake surface, and remains upright throughout. How much work is required to pull the bucket slowly straight up so that the bottom point is just above the lake surface?
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