An refrigerator keeps food in the freezer portion at and dumps excess heat into the kitchen, whose temperature is If the refrigerator has half the coefficient of performance of an ideal reversible refrigerator, what is the refrigerator’s coefficient of performance under these conditions?

A. 1.1
B. 4.2
C. 2.0
D. 3.7


B. 4.2

Physics & Space Science

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Which of the following planets has a stratosphere?

A) Mercury B) Venus C) Earth D) Mars E) all of the above

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What is the energy density in the magnetic field 25 cm from a long straight wire carrying a current of 12 A? (?0 = 4? × 10-7 T ? m/

A) A) 7.3 × 10-5 J/m3 B) 3.7 × 10-5 J/m3 C) 3.6 × 10-4 J/m3 D) 1.2 × 10-4 J/m3 E) The density cannot be determined without knowing the volume.

Physics & Space Science

If the number of turns on the secondary coil of a transformer are less than those on the primary, the result is a

A) step-down transformer. B) step-up transformer. C) 120-V transformer. D) 220-V transformer. E) a dc transformer.

Physics & Space Science

One can reverse the north and south poles of an electromagnet by reversing the direction of current flow through it

Indicate whether the statement is true or false

Physics & Space Science