A hollow speherical silver ball has an external diameter 4 cm and internal diameter 2 cm thick. Then the volume of the silver used in the ball is : ?->(Show Answer!)

1. A hollow speherical silver ball has an external diameter 4 cm and internal diameter 2 cm thick. Then the volume of the silver used in the ball is :

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By: anil on 05 May 2019 01.41 am

External radius, $$R = 2$$ cm and Internal radius, $$r = 1$$ cm => Volume of external sphere = $$frac{4}{3} pi R^3$$ = $$frac{4}{3}pi (2)^3 = frac{32 pi}{3}$$ Volume of internal sphere = $$frac{4}{3} pi r^3$$ = $$frac{4}{3}pi (1)^3 = frac{4 pi}{3}$$ $$ herefore$$ Volume of silver = $$frac{32 pi}{3} - frac{4 pi}{3}$$ = $$frac{28 pi}{3} cm^3$$

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