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College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300

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BuyFindarrow_forward

College Physics

11th Edition
Raymond A. Serway + 1 other
ISBN: 9781305952300
Textbook Problem

A window air conditioner is placed on a table inside a well-insulated apartment, plugged in and turned on. What happens to the average temperature of the apartment? (a) It increases. (b) It decreases. (c) It remains constant. (d) It increases until the unit warms up and then decreases. (e) The answer depends on the initial temperature of the apartment.

To determine
what will happen to the average temperature of the apartment.

Explanation

The second law of thermodynamics states that “If two systems are in thermal contact net thermal energy transferees spontaneously by heat from the hotter system to the colder system. Thus, work must be done to transfer thermal energy from a colder system to a hotter system.

When the air conditioner is placed in a table in the well-insulated apartment, the air conditioner will take the heat from the room and after dong a work it exhausts the hotter air out to the same room.

According to second law of thermodynamics,

QH=QC+W

  • QH is the heat given of the air conditioner
  • QC is the heat taken from the room
  • W is the work done by the air conditioner

Thus, the heat given of from the air conditioner will be more than the heat taken from the room

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