A sphere of solid material of specific gravity `8` has a concentric spherical cavity and just sinks in water. The ratio of radius of cavity to that of outer radius of the sphere must be

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 radius of the cavity to that of the outer radius of the sphere.

A sphere of material of relative density 8 has a concentric spherical cavity and just sinks in water.If the radius of the sphere is 2cm then the volume of the cavity is

A sphere of solid material of relative density 9 has a concentric spherical cavity and sinks in water. If te radius of the sphere be R. Then the radius of the cavity (r) will be related to R as

A sphere has a concentric spherical cavity. The specific gravity of the material of the sphere is 8. the sphere is place on a surface of water. If in the equilibrium position the sphere just sinks in water, the ratio of theradius of cavity to the outer radius of the sphere is

A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will

A solid ball of metal has a concentric spherical cavity within it. If the ball is heated, the volume of the cavity will

A sphere of radius R has a concentric spherical cavity of radius r. The relative density of the material of the sphere is sigma . It just floats when placed in tank full of water. The value of R/r is