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Question

The volume of a solid iron sphere is 20483πcm3. This sphere is melted and eight rings of iron plates of external radii 623 cm and thickness 3 cm are made. Find the internal radius of each ring.


Solution


Volume of cylindrical rings =Volume of sphere
8×π(R2r2)×h=20483π8×π((203)2r2)×3=20483π(203)2r2=20483×3×8
Solving we get r =4 cm

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