Question
A hollow spherical metallic ball has an external diameter 6 cm and is `1/2` cm hick. The volume of metal used in he ball is :
Answer: Option D
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External radius = 3 cm . Internal radius = (3 - 0.5) cm = 2.5 cm
Volume of the metal = `[4/3 xx 22/7 xx (3)^3 - (2.5)^3] cm^3`
= `(4/3 xx 22/7 xx 91/8) cm^3`
=`(143/3)^3cm^3`
=` 47 2/3 cm^3`
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