Got this question wrong on this weeks physics quiz and can't figure out why. I keep getting the same answer - which was wrong - over and over. What am I missing?(adsbygoogle = window.adsbygoogle || []).push({});

By how much will a slab of concrete 18 m long contract when the temperature drops from 24 °C to -16 °C? (The coefficient of linear thermal expansion for concrete is 10-5 per degree C.)

Answers are in centimeters.

Formula:

change in length= a* Lo* change in temp

Lo = 1800cm

A = 10-5

change in T = 24- (-16) = 40

I keep coming up with .7 cm

the answer was .5cm

Where did I go wrong? Any help greatly appreciated

Thank you

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# Homework Help: Linear thermal expansion

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