An ideal, reversible refrigerator keeps food in the freezer portion 
and dumps excess heat into the kitchen, whose temperature is 
What is the refrigerator’s coefficient of performance under these conditions?
A. 7.4
B. 4.0
C. 8.4
D. 2.1
A. 7.4
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The density of a neutron star is
a. about the same as that of a white dwarf. b. about the same as that of the sun. c. about the same as an atomic nucleus. d. zero
The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2?
A) 11.6 × 105 Pa B) 11.6 × 104 Pa C) 2.9 × 105 Pa D) 2.9 × 104 Pa
How do low mass stars transport newly formed elements into the interstellar medium?
A) stellar winds B) F supernova explosions C) formation of planetary nebula D) A and B E) A and C
The velocity of propagation of a transverse wave on a 2.0 m long string fixed at both ends is 200. m/s. Which one of the following is not a resonant frequency of this string?
A) 50 Hz B) 200 Hz C) 25 Hz D) 100 Hz