APFIVE Internal Energy in an Isolated System
Two identical copper blocks, initially at different temperatures, are placed in thermal contact inside a thermally insulated container. Which of the following best describes the energy of the two-block system as it reaches thermal equilibrium?
A
Redistribution of internal energy with no net change for the system
B
Conversion of thermal energy to mechanical energy
C
Decrease in total internal energy of the system
D
Increase in average molecular kinetic and potential energy
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