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

Why must telephone or power lines necessarily sag a little? Which ob

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

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