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A steel ruler is calibrated to read true at 23.9 °C. A draftsman uses the ruler...

A steel ruler is calibrated to read true at 23.9 °C. A draftsman uses the ruler at 39.5 °C to draw a line on a 39.5 °C copper plate. As indicated on the warm ruler, the length of the line is 0.253 m. To what temperature should the plate be cooled, such that the length of the line truly becomes 0.253 m?
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