The radius of a sphere is 9 cm It is melted and drawn into a wire of diameter 2 mm Find the lenght of the wire in meters
A
972
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B
792
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C
292
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D
97.2
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Solution
The correct option is C 972 The wire is cylindrical in shape So its volume will be =πr2h where h is the length of the wire here Volume of the sphere = Volume of the wire i.e. =π(0.1)2h=43π(9)3 (Since 1 mm = 0.1 cm) or h=97200 cm = 972 m