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Question: a wire which is 5 km long made of copper...

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A wire which is 5 km long made of copper is connected to a battery. Because it is very long, its resistance is not neglected and the power dissipated by the wire alone is 14 watts. The same wire is melted down and shaped into another wire. When this wire is connected to the same battery, it dissipates 86 watts. What is the length of the second wire in km?

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