A Sphere Is Made Up of Two Layers: the First

A sphere is made up of two layers: The first is lead (density 11,340 kg/m³) and is of radius R. The second is tin, (7,310 kg/m³) and is concentric with the first, from radius R to radius 2R. The sphere is placed in a pool of mercury (density 13,600 kg/m³) . How much of the volume of the sphere is below the surface?

A) 68.5%
B) 57.5%
C) 57.0%
D) 64.2%

Correct Answer:

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