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By how much will a slab of concrete contract when the temperature drops?

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By how much will a slab of concrete 18m long contract when the temperature drops from 24 degrees C to -16 degrees C. (the coefficent of linear thermal expansion for concrete is 12*10^-6 per degree C.)

a. 0.86 cm
b. 0.52 cm
c. 8.6 cm
d. 0.17 cm

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In six lines of explanation and computation, the problem is solved.

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