how many solid spheres of diameter=6cm are required to be melted to form a solid metal cylinder of height=45cm and diameter=4cm?
radius ( R ) of cylinder = 2cm
height of cylinder = 45cm
radius ( r ) of sphere = 3 cm
No of solid shperes = volume of cylinder / volume of sphere
= pi R2 h / 4/3 pi r 3
= 2 2 * 45 / 4/ 3 * 3 3
= 4 * 45 / 4 / 3 * 27 9
= 4 * 45 9 / 4 * 9
= 5
So the no. of solid sppheres be 5 .
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