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:

Reserved

Refers to identifiers or words in programming languages that are used by the language itself and therefore cannot be used as names by the programmer.

Automatic Variables

Automatic variables are local to the block in which they are defined and are automatically created and destroyed upon entering and exiting the block, respectively.

Alive

In computing, often refers to a process or entity that is currently active or running.

Local Static Variables

Variables defined within a function that maintain their value between function calls and are initialized only once.