A clay pot at room temperature is placed in a kiln, and the pot's temperature doubles. How much more heat per second is the pot radiating when hot compared to when cool?

16 times.
Because According to stfan_boltzma's law, heat rdaiated by a body proportinal to 4th power of its obsolute temperature.
so, when temperature becomes double, heat radiation becomes 2^4 = 16 times.
A clay pot at room temperature is placed in a kiln, and the pot's temperature doubles....
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