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A sphere made of a material of specific gravity 8 has a concentric spherical cavity and just sinks in water. calculate the ratio of the

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A sphere made of a material of specific gravity 8 has a concentric spherical cavity and just sinks in water. calculate the ratio of the ratio of the radius of the cavity to that of the outer radius of the sphere.

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Let the radius of the sphere  be R and that of the cavity be r. Then, since the sphere just sinks in water,

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