Block, water and a bit of oil?
An oil have a density of floats on water. A rectangular block of wood high and with a density floats partly in the oil and partly in the water. The oil completely covers the block. How far below the interface between the two liquids is the bottom of the block? (in meters)
More questions like this from Serway College Physics.
The answer is 0.017.
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Assume the cross-sectional area of the block to be A m² and x met. to be the block depth in water. Then, Weight of wooden block = Weight of displaced water + Weight of displaced oil or 0.04(A)(960) = x(A)(1000) + (.04-x)(A)(930), which readily yields, x = 0.0171429 met.