Question

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A copper sphere is 18cm the sphere is melted and drawn into a long wire of uniform circular cross section if the length of the wire is 108 find its diameter

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Answer 1

volume of both the structures should be same,if it contains the same material.

volume of sphere@=4/3 ×πr^3

volume of with=πr^h

volume of sphere=4/3×π×9×9. (r=18/2)

so

4/3 ×π×9×9×9=πr^2×108

3×36×9/108=r^2

r=3

diameter=6

hope it helps you dude