Solving a problem in physics section 18 paragraph 71 qu

Solving a problem in physics section 18 paragraph 71 qu

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.

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Detailed solution. Decorated in Microsoft Word 2003. (Target decided to use formula editor)