Refrigerators: a Refrigerator Has a Coefficient of Performance Equal to 4.2

question 24

Multiple Choice

Refrigerators: A refrigerator has a coefficient of performance equal to 4.2. How much work must be done on the refrigerator in order to remove 250 J of heat from the interior?

• A) 60 J
• B) 120 J
• C) 250 J
• D) 480 J
• E) 1050 J

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Definitions:

Cancer

Disease that occurs when malignant cells physically and metabolically disrupt body tissues.

Continental Shelf

The extended perimeter of each continent, covered by relatively shallow seas and gulfs, which is important for marine life, ecology, and human economic activities.

Ocean Province

A broad region within an ocean characterized by specific oceanographic or ecological features.

Neritic

Relating to the shallow part of the sea near a coast and overlying the continental shelf, characterized by abundant marine life.