A vessel contains oil(density 0.8 g/cc) over mercury(density 13.6 g/cc). A homogeneous sphere floats with half its volume immersed in mercury and the other half in the oil . The density of the material of the sphere is
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"""The total weight is balanced by the displaced volumes of the two different liquids or fluids. Let volume be V and density n hence the equilibrium equation being Vng=V/2(0.8)g + V/2(13.6)g.
Regarding the second question, you take the sum of the two buoyant forces. One of the many doubts is whether the oil will produce any light effects to or on the sphere.
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