Question

1. The telephone wires which sag in summer become straight in winter.​

Answer 1

Answer:

During summer, the wires heat up and expand in length. Hence it sags down. During winter, the temperature drops and wires cool down. Due to decrease in temperature,it contracts in length and hence becomes straight

Answer 2

Answer:

Here's your 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.

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