71. Black walled metallic cube with a side of a = 10 cm filled with water at a temperature of T1 = 80 ° C. Determine the time ? cooling cube to a temperature T2 = 30 ° C, if it is placed inside the vacuum chamber zachernёnnoy. The temperature of the chamber walls is maintained close to absolute zero.
Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)
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