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Thermal Expansion

Explain the f...

Question

Explain the following:
The telephone wires break in winter.

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Solution

Most telephone wires are made from copper.
When temperature decreases in winter, it contracts, and becomes too tight between the poles. Hence, telephone wires may break in winter.

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Similar questions

Explain the following:

(a) The telephone wires break in winter.

(b) Iron rims are heated before they are fixed on the wooden wheels.

(c) The gaps are left between the successive rails on a railway track.

(d) A glass stopper stuck in the neck of a bottle can be removed by pouring hot water on the neck of the bottle.

(e) A cement floor is laid in small pieces with gaps in between.

Q. Give scientific reasons.

(a) An ordinary glass bottle cracks when boiling water is poured into it, but a borosil glass bottle does not.
(b) The telephone wires which sag in summer become straight in winter.
(c) Dew drops form on the grass in winter.
(d) In winter, why does an iron pillar feel colder than a wooden pole ?

Sagging of telephone wires during summer is due to thermal expansion.

Telephone wires _________ during winters.

Why are the telephone or telegraph wires laid in summer kept slightly loose, while in winter they are tight?

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Thermal Expansion

Standard VII Physics

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