Two discs one of density `7.2 g//cm^(3)` and the other of density `8.9g//cm^(3)` are of same mass and thickness. Their moments of inertia are in the ratio

Two discs cone of density 7200 kg//m^(3) and another of density 9000km//m^(3) have the same mass and thickness. What is the ratio of their moments of inertia?

For a disc of given density and thickness, its moment of inertia varies with radius of the disc as :

For a disc of given density and thickness, its moment of inertia varies with radius of the disc as :

For a disc of given density and thickness, its moment of inertia varies with radius of the disc as :

A piece of iron (density 7.6 g cm^(-3) ) sinks in mercury (density 13.6 g cm^(-3) ).

Two discs of same mass and same thickness have densities as 17 g//cm^(3) and 51 g//cm^(3) . The ratio of their moment of inertia about their central axes is

Two discs of same mass and same thickness have densities as 17 g//cm^(3) and 51 g//cm^(3) . The ratio of their moment of inertia about their central axes is

Two discs of same material have the same mass. If their thickness are in the ratio 1:3 , then their moment of inertia are in the ratio