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23 Nov 2019

A certain refrigerator is rated as being 34% as efficient as a Carnot refrigerator. To remove 109 J of heat from the interior at 0 °C and eject it to the outside at 23 °C, how much work must the refrigerator motor do?

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Collen Von
Collen VonLv2
28 Mar 2019

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Related textbook solutions

Physics: Principles with Applications
7th Edition, 2013
Giancoli
ISBN: 9780321625922

Related questions

How much work must be done to extract 1.5 J of heat from areservoir at 7.0 deg C and transfer it to one at 26.0 deg C bymeans of a refrigerator using a Carnot cycle.

How much work must be done if the temperature of the cold reservoiris reduced to -77 deg C and the hot one held at 26.0 deg C.


I got the first one. I just want to know how to solve the secondone. Thank you!!!

Suppose that you want to freeze 1 kg of water for a party, and onlyhave 5 minutes to do it. Relying on nothing but your keen physicalabilities, a dixicup, duct tape and a piece of string, you manageto build a refrigerator unit which can do the job.
The temperature inside the refrigeration unit is 273 K, and thetemperature outside is 350 K. Since you are a brilliant UIUCstudent, assume that your refrigerator has the maximum possibleefficiency. The Latent Heat of Fusion of water is 3.33×10?5J/kg
Assume that the initial temperature of the water is 273 K.

1. What is the change (including the sign) in entropy in the waterper second in J/(Ks)?
2. What is the heat flow ( Q_hot/time ) into the Hot well persecond in J/s?
3. How much POWER must you provide to drive your refrigerator inWatt W? (That is work done per second?)

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