A sphere of mass m
A sphere of mass m covers a circular hole of radius r at the bottom of a vessel filled with water of specific mass ρ. By slowly lowering the water level, at a given moment the sphere is detached from the bottom of the vessel. Mark the alternative that expresses the height h of the water level for this to happen, knowing that the top of the sphere, at a height a of the bottom of the container, is always covered with water.
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