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from NATIONAL HILL VIEW PUB SCHOOL, asked a question
Subject: Math , asked on 2/3/13

A hollow spherical shell is made of a metal of density 4.5 g per cm2 .If tits internal and external radii are 8 cm & 9 cm respectively, find the weight of the shell.

, 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 =

hope this helps you

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From Delhi Public School, added an answer, on 2/3/13
• r=internal radii= 8
• R = external radii=9
• volume of hollow sphere=4/3.22/7.(R3 - r3)
• putting value of R and r
• 4/3.22/7.(9.9.9.-8.8.8)
• 4/3.22/7.(791-512)
• 4/3.22/7.279
• 8184/7cm3
• weight of 8184/7 cm3 = 8184/7.4.5=5261.1 gms.
• 0

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