Determine how long it will take for a copper ball placed in a vacuum to cool from T1 = 500 K to T2 = 300 K. The radius of the ball is 1 cm, the absorption capacity of the ball surface is e = 0.8, the specific heat capacity of copper is C = 390 J/(kg• deg), copper density p = 8.9•103 kg/m3. Neglect the influence of surrounding objects.

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