A 15.4 g block of copper whose temperature is 331 K is placed in an insulating b

Question

A 15.4 g block of copper whose temperature is 331 K is placed in an insulating box with a 137 g block of lead whose temperature is 136 K. (a) What is the equilibrium temperature of the two-block system? (b) What is the change in the internal energy of the two-block system between the initial state and the equilibrium state? (c) What is the change in the entropy of the two-block system? The heat capacities of copper and lead are 386 J/kg.K and 128 J/kg-K, respectively Un (a) Number 185.2 (b) NumberTT 866.7 (c) Number [1.96 Units3 Units J/K 866

Explanation / Answer

b) 0 J

As the two blocks are placed in insulating box there is no loss of heat energy. So, there is no net change in internal energy of the two block system. But internal energy of lead block increases and internal energy of copper block decreases.

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