AP Physics 2
9.6 Entropy and the Second Law of Thermodynamics
A warm rock at initial temperature \(T_h\) is dropped into a large, cool lake at temperature \(T_c\), where \(T_h > T_c\). Heat transfers spontaneously from the rock to the lake water until the rock reaches thermal equilibrium with the lake. What are the signs of the entropy change of the rock, \(\Delta S_{\text{rock}}\), and the total entropy change of the universe, \(\Delta S_{\text{univ}}\), for this process?
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