A camper is about to drink his morning coffee. He pours 400 grams of coffee, initially at 75°C into a 250-g aluminum cup, initially at 16°C
What is the equilibrium temperature of the coffee-cup system, assuming no heat is lost to the surroundings? The specific heat of aluminum is 900 J/kg ? K, and the specific heat of coffee is essentially the same as that of water, which is 4186 J/kg ? K. A) 45°C
B) 62°C
C) 65°C
D) 68°C
E) 71°C
D
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