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.

Asked by Shreya Kse(student), on 2/3/13

#### Answers

- r=internal radii= 8
- R = external radii=9
- volume of hollow sphere=4/3.22/7.(R
^{3 }-^{ }r^{3}) - 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
- 8184/7cm
^{3} - weight of 8184/7 cm
^{3 }= 8184/7.4.5=5261.1 gms.

Posted by Priyanka Aggarw...(student), on 2/3/13

EXPERT ANSWER

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

Posted by Ajanta Trivedi(MeritNation Expert), on 2/3/13

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