Question

The telephone wires which sag in summer become straight in winter . 
option:True /False



please help me
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Answer 1

Answer:

Explanation:

Because the cores of overhead wires are made from copper. Metals expand with heat and contract with cold. The higher temperatures in summer make the copper expand - so the lines get slightly longer. In winter, the reverse happens - the lines contract and tighten up.

Answer 2

Explanation:

true

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