Volume of a sphere = 4/3*pi*radius3
Surface area of a sphere = 4*pi*radius2
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Provided they are the same thickness, the larger sphere will have a radius of 10.165cm
To find the volume of a marble, you would use the formula for the volume of a sphere, which is V = (4/3)πr^3, where V is the volume and r is the radius of the marble. Measure the diameter of the marble and divide it by 2 to get the radius. Then, plug the radius into the formula to calculate the volume of the marble in cubic units.
Its diameter is 2R, whatever the mass.
I believe it is I = mk^2 where k is radius of gyration and m is mass.
Density = Mass/Volume so Volume = Mass/Density. Therefore the Volume can be calculated. Volume = Area [of cross section] * Width So Width = Volume/Area.