Q. 204.0( 4 Votes )
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Answer :
Volume of a sphere = (4/3)πr3
Volume of a cylinder = πr2h
Given, radius of the internal and external surfaces of a hollow spherical shell are 3 cm and 5 cm respectively. It is melted and recast into a solid cylinder of height 
cm.
Volume of material = Volume of the solid cylinder
⇒ r2 = 49
⇒ r = 7 cm
Diameter = 14 cm
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