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
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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.
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
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.
Which of the following planets has a stratosphere?
A) Mercury B) Venus C) Earth D) Mars E) all of the above