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Density of a solid floating cube.

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A solid cube of unknown composition is seen floating upright in water with 30% of it above the surface. What is the density of the material?

I believe the answer is 0.70 g/cm^3.

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The mathematical solution is provided for the following question: A solid cube of unknown composition is seen floating upright in water with 30% of it above the surface. What is the density of the material?

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