(a) An aluminum power transmission line has a resistance of 0.0580 /km. What is its mass per...

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(a) An aluminum power transmission line has a resistance of 0.0580 Ω/km. What is its mass per kilometer?

(b) What is the mass per kilometer of a copper line having the same resistance? A lower resistance would shorten the heating time. Discuss the practical limits to speeding the heating by lowering the resistance.

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