Physics, asked by Anonymous, 9 months ago

Why must telephone or power lines necessarily sag a little?
Which object will cool faster when kept in open air, the
one at 300°C or the one at 100°C Why?​

Answers

Answered by sociocafez2018
0

Answer:

Go And Ask Your Teacher

Answered by BendingReality
14

Answer:

a. The sag is allowed for contraction in winter. If no sag is allowed , the wire may snap in extremely cold weather.

b. The object at 300 C will not cool faster than the object at 100 C. It is because of Newton's law of cooling. i.e Rate of cooling is directly proportional to temperature difference.

- d Q / d t ∝ ( T - T₀ ) .

Read more :

Two identical rectangular strips of copper, and the other  of steel are riveted to form a bimetallic strip. What will happen on heating?​

https://brainly.in/question/15893791

Similar questions