The compressor in a certain Carnot refrigerator performs 480 J of work to remove 150 J of heat from the interior of the refrigerator. How much heat must the coils behind the refrigerator discharge into the kitchen?
A) 110 J
B) 150 J
C) 330 J
D) 480 J
E) 630 J
Question 2
A 2.0-kg block of aluminum at 50C is dropped into 5.0 kg of water at 20C and the temperature is allowed to stabilize.
What is the total change in entropy during this process, assuming no heat is exchanged with the environment? The specific heat of aluminum is 910 J/(kgK) and the specific heat of water is 4190 J/(kgK). A) 8.2 J/K
B) 10 J/K
C) 3.3 10-2 J/K
D) 3.8 10-3 J/K
E) 2.4 10-3 J/K
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