What is the temperature inside an ideal refrigerator-freezer that operates with

Question

What is the temperature inside an ideal refrigerator-freezer that operates with a COP = 6.0 in a 22degree C room? Express your answer using two significant figures. T_L An aluminum bar of mass 2.00 kg at 300 DegreeC is thrown into a lake. The temperature of the water in the lake is 15.0 DegreeC; the specific heat capacity of aluminum is 900 J/(kg middot K). Since the aluminum bar is not an isolated system, the second law of thermodynamics cannot be applied to the bar alone. Rather, it should be applied to the bar in combination with its surroundings (the lake). Assume that the entropy change of the bar is -73.5 J/K, what is the change in total entropy delta S_total? Express your answer numerically in joules per Kelvin Delta S_total =

Explanation / Answer

For refrigerator,

COP = Tc / Th-Tc

6=1/((22+273/Tc)-1)

(295/Tc)-1 = (1/6)

295/Tc =7/6

Tc = 6/7*295 =252.86 K= -20.14 C.

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