Question discussion

A metallic sphere of radius 9 cm is melted and drawn into a wire of diameter 4 mm. What is the length of the wire?

Correct answer: C

Explanation

Volume = (4/3)π(9)³ = 972π cm³; wire radius is 0.2 cm, so length = 972π/(π × 0.04) = 24,300 cm = 243 m.

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