A rock of mass 4.0 kg at a temperature of is dropped vertically downward a distance of m into a shallow lake that is also at a temperature of .
What is the resulting change in the entropy of the universe?
If the temperature of the rock is when it is dropped, what is the change in the entropy of the universe? Use a value of for the specific heat of the lake’s water and use a value of for the specific heat of the rock. Assume that the drag on the rock from the air is negligible.
Find the entropy change of 20 g of steam at a temperature of when it condenses to water at the same temperature. Use a value of kJ/kg for the latent heat of vaporization of water.
A Carnot engine operates between baths with temperatures of and , and extracts 300 kJ of energy in each cycle.
Find the change in entropy of the hot bath in each Carnot cycle.
Find the change in entropy of the cold bath in each Carnot cycle.