Question: A cubical box 20 cm on a side is constructed from 1.2-cm thick concrete panels. A 100 W light bulb is sealed inside the box.

A cubical box 20 cm on a side is constructed from 1.2-cm thick concrete panels. A 100 W light bulb is sealed inside the box.
What is the air temperature inside the box when the light is on if the surrounding air temperature is 20°C?

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