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Physics / University Physics 13 / Chapter 20 / Problem 12E

University Physics | 13th Edition | ISBN: 9780321675460 | Authors: Hugh D. Young, Roger A. Freedman

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A freezer has a coefficient of performance of 2.40. The

Chapter 20, Problem 12E

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QUESTION:

A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.80 kg of water at 25.0o C to 1.80 kg of ice at - 5.0o C in one hour. (a) What amount of heat must be removed from the water at 25.0o C to convert it to ice at - 5.0o C? (b) How much electrical energy is consumed by the freezer during this hour? (c) How much wasted heat is delivered to the room in which the freezer sits?

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QUESTION:

A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.80 kg of water at 25.0o C to 1.80 kg of ice at - 5.0o C in one hour. (a) What amount of heat must be removed from the water at 25.0o C to convert it to ice at - 5.0o C? (b) How much electrical energy is consumed by the freezer during this hour? (c) How much wasted heat is delivered to the room in which the freezer sits?

ANSWER:

Q:A freezer has a coefficient of performance of 2.40. The freezer is to convert 1.80 kg of water at 25.0o C to 1.80 kg of ice at - 5.0o C in one hour. (a) What amount of heat must be removed from the water at 25.0o C to convert it to ice at - 5.0o C? (b) How much electrical energy is consumed by the freezer during this hour? (c) How much wasted heat is delivered to the room in which the freezer sits?

Step by Step Solution

Step1 of 5

Given

Mass of water to be converted to ice:

Temperature of water:

Water losses heat till freezing temperature after which water has a phase change to ice.

Temperature lot as heat:

More heat is drawn from ice to get required temperature .

Required temperature of ice:

Required mass of ice:

Coefficient of performance

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