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A refrigerator has a coefficient of performance of 2.10 . Eachcycle, it absorbs $3.40 \times 10^{4} \mathrm{J}$ of heat from the cold reservoir.(a) How much mechanical energy is required each cycle tooperate the refrigerator? (b) During each cycle, how much heatis discarded to the high-temperature reservoir?
(a) $|W|=1.48 \times 10^{4} \mathrm{J}$(b) $\left|Q_{H}\right|=4.58 \times 10^{4} \mathrm{J}$
Physics 101 Mechanics
Chapter 16
The Second Law of Thermodynamics
Temperature and Heat
Thermal Properties of Matter
The First Law of Thermodynamics
University of Michigan - Ann Arbor
Simon Fraser University
University of Sheffield
McMaster University
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In the first part of this problem, we will calculate mechanical energy needed toe Run the refrigerator for recycle as we know that coefficient off for formance of refrigerator is defined as the amount of heat absorbed from cold visit wire, divided by mechanical energy supply to the refrigerator. By rearranging we can, right? This is mechanical energy given to the refrigerator equal toe amount if he'd absorbed from called reserve wire, divided by coefficient off performance as a motor feet absorbed from called the wire is three point 10 times 10 to the power for you. Do you worried by coefficient of performance of refrigerator is two points 10 Sorry, I did a little mistake here. He'd absolved from the cold with Davaris three point 40 So this gives us mechanical energy supplied to the forget er our cycle equal toe 1.62 times 10 to the power for you're now in the next part. We want to calculate the A motor feet that is discarded toe the hot reserve wire again by using the relation for refrigerator that is, he discarded to the goal he discarded to the heart is a wire equal toe he'd extracted from called the terroir Plus work done on the refrigerator as heat extracted from Gold Reservoir is 3.40 times 10 to the power for JAL. Well, there's mechanical well done on the refrigerator or cycle is one point 62 times 10 to the power for you're This gives us the motor feet discarded toe the heart reserve wire, part cycle equal toe 5.2 times 10 to the power for June. They're send out the problem. Thanks for watching.
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