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Find the length of 13.2 kg of copper wir...

Find the length of 13.2 kg of copper wire of diameter 4mm, when 1 cubic cm of copper weights 8.4 gm.

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Let the length of the wire be `h` metres. Then,
Volume`xx8.4=13.2xx1000`
`⇒22/7xx(2/10)^2 xxhxx8.4=13.2xx1000`
`⇒h=12500cm =125` metres.
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