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OpenStudy (anonymous):

in the construction of bridges and sky scrapers, gaps must be left between adjoining steel beams to allow for expansion and contraction of the metal due to heating and cooling. the temperature of a sample of iron with a mass of 20.0 grams changed from 60.0 C to 35.0 C. How many Joules of heat were released?

OpenStudy (anonymous):

Figured it out, it's 225 J.

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