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 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 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 and made of material of relative density sigma has a concentric cavit of radius r. It just floats when placed in a tank full of water. The value of the ratio R//r will be

A steel block having an internal cavity weighs 234g in air and 197g in water. If the density of steel is 7.8 g cm^(-3) then the volume of the cavity is

A metallic sphere with an internal cavity weighs 40 gwt in air and 20 gwt in water. If the density of the material with cavity be 8g per cm^(3) then the volume of cavity is :

Find the volume of a sphere of radius 11.2cm

Inside a uniform sphere of density rho there is a spherical cavity whose centre is at a distance l from the centre of the sphere. Find the strength of the gravitational field inside the cavity.

A fixed sphere of radius R and uniform density rho has a spherical cavity of radius R//2 such that the surface of the cavity passes through the centre of the sphere. A particle of mass m is located at the centre (A) of the velocity. Calculated (a) The gravitational field at A . (b) The velocity with which the particle strikes the centre O of the sphere. (Neglect earth's gravity)