Question

Power lines have sag in part to accommodate the thermal expansion and contraction that they experience...

Power lines have sag in part to accommodate the thermal expansion and contraction that they experience over the course of a day. If copper has a coefficient of thermal expansion of 17x10-6 m/o C and a powerline has a length of 10 m at 15o C, what would its change in length be in the middle of a Florida summer, where the temperature is 98o F?

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Answer #1

Coefficient of thermal expansion

Initial length

Initial temperature

Final temperature

We know

Final temperature

Consider the change in length is

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