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प्रश्न
Give reasons for the following:
Telephone wires sag in summer.
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उत्तर
Telephone wires sag in summer because due to heat of the sun, the wire expands and increases in length, thus they sag in summer.
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संबंधित प्रश्न
A longer rod expands ........... than a shorter rod on being heated to the same temperature.
The increase in length of a metal rod depends on
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Describe an experiment to show that same volume of different liquids heated to same rise in temperature expand by different amounts.
Give scientific reason.
The telephone wires which sag in summer become straight in winter.
Define the following term:
Coefficient of superficial expansion
Solids ______ on heating and ______ on cooling.
Analogy:
Expansion is length:: Linear expansion.
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