Solved: At 4 p.m., a hot coal was pulled out of a furnace and allowed to cool at room
Chapter 1, Problem 27(choose chapter or problem)
At 4 p.m., a hot coal was pulled out of a furnace and allowed to cool at room temperature (75F). If, after 10 minutes, the temperature of the coal was 415F, and after 20 minutes, its temperature was 347F, find the following: (a) The temperature of the furnace. (b) The time when the temperature of the coal was 100F.
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