A hollow spherical shell is made of a metal of density 4.5 g per cm^{2} .If tits internal and external radii are 8 cm & 9 cm respectively, find the weight of the shell.

Ajanta , Meritnation Expert added an answer, on 2/3/13

let the internal radius of the hollow shell be r = 8 cm

let the external radius of the hollow shell be R = 9 cm

therefore the volume of the spherical shell V =

weight of 1 cubic cm = 4.5 gm

thus the weight of the spherical shell =

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