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?
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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 ) .
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