A vessel contains oil (density = 0.8 g/cm³) over mercury (density = 13.6 g/cm³). A homogeneous sphere floats with half of its volume immersed in mercury and the other half in oil. The density of the material of the sphere (in g/cm³) is:
Correct answer: C. 7.2
- A. 3.3
- B. 6.4
- C. 7.2
- D. 12.8
Explanation
The density of the sphere is the average of the two fluiddensities, since it is half-immersed in eachρ=0.8+13.6/2 = 7.2 g/cm³.
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