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Metallic spheres of radii 6 cm, 8 cm, and 10 cm, respectively, are melted to form a single solid sphere. Find the radius of the resulting sphere. - CBSE Class 10 - Mathematics

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Question

Metallic spheres of radii 6 cm, 8 cm, and 10 cm, respectively, are melted to form a single solid sphere. Find the radius of the resulting sphere.

Solution

Radius (r1) of 1st sphere = 6 cm

Radius (r2) of 2nd sphere = 8 cm

Radius (r3) of 3rd sphere = 10 cm

Let the radius of the resulting sphere be r.

The object formed by recasting these spheres will be same in volume as the sum of the volumes of these spheres.

Volume of 3 spheres = Volume of resulting sphere

`4/3pi[r_1^3+r_2^3+r_3^3] = 4/3pir^3`

`4/3pi[6^3+8^3+10^3] = 4/3 pir^3`

r3 = 216 + 512 + 1000 = 1728

r = 12 cm

Therefore, the radius of the sphere so formed will be 12 cm.

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APPEARS IN

 NCERT Solution for Mathematics Textbook for Class 10 (2019 to Current)
Chapter 13: Surface Areas and Volumes
Ex. 13.30 | Q: 2 | Page no. 251

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Solution Metallic spheres of radii 6 cm, 8 cm, and 10 cm, respectively, are melted to form a single solid sphere. Find the radius of the resulting sphere. Concept: Conversion of Solid from One Shape to Another.
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