Advertisements
Advertisements
प्रश्न
Give reasons for the following:
Telephone wires sag in summer.
Advertisements
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.
APPEARS IN
संबंधित प्रश्न
The increase in length of a metal rod depends on
What is matter? What is it composed of?
Two identical rods of copper are heated to different temperatures — one by 5°C and the other by 10°C. Which rod will expand more?
An iron washer is heated. State the effect on its mass.
What is the velocity of thermal radiations?
The diagram shows a sketch graph showing a change in volume of a given mass of ice at -5°C to water at 15°C.
(i) Why does the temperature along BC remain constant?
(ii) When is the volume of water minimum?
(iii) At what temperature does water have maximum density? Explain.
Solids ______ on heating and ______ on cooling.
Borosilicate glass do not expand much on being heated.
What is thermal expansion?
