Question
How many spherical bullets can be made out of a lead cylinder 15 cm high and with base radius 3 cm, each bullet being 5 mm in diameter ?
Answer: Option B
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Volume of cylinder = `pi xx (3)^2 xx 15 = 135 pi cm^3`
Radius of 1 bullet = `5/2 mm = 5/20 cm = 1/4 cm`
Volume of 1bullet = `(4/3 pi xx 1/4 xx 1/4 xx 1/4) cm^3 = pi/48 cm^3`
`:.` Number of bullets = `(135 pi xx 48/pi)` = 6480.
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