A stick of butter has dimensions 130 mm × 30 mm × 30 mm and density pb = 870 kg/m³. It is placed in a bowl of cool water and floats with its long side oriented horizontally. What volume of butter is submerged? (As always, drawing a force diagram is a great first step.) What is the smallest amount of mass m you must place on top so that the butter becomes fully submerged? Suppose that the stick is balanced very delicately so that it floats with its long side oriented vertically. How would this change your answers above?

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