A cube of copper of edge 11 cm is melted and formed into a cylindrical wire of diameter 0.5 cm What length of wire will be obtained from the cube?
67.76 m
76.67 m
60 m
70 m
A
70 m
B
60 m
C
67.76 m
D
76.67 m
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Solution
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Given: Side of cube s=11 cm; diameter d=0.5 cm; r=0.25 cm Volume of copper cube=113=1331= Volume of copper cylinder or 1331=πr2h or 1331=227×(0.25)2h or h=1331×722×(0.25)2=6776cm=67.76m
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