Suppose object C is in thermal equilibrium with object A and with object B. The zeroth law of thermodynamics states:
A. that C will always be in thermal equilibrium with both A and B
B. that C must transfer energy to both A and B
C. that A is in thermal equilibrium with B
D. that A cannot be in thermal equilibrium with B
E. nothing about the relationship between A and B
Answer: C. that A is in thermal equilibrium with B
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A very loud train whistle has an acoustic power output of 80 W. If the sound energy spreads out spherically, what is the intensity level in dB at a distance of 100 meters from the train? (I0 = 10-12 W/m2)
a. 78.3 dB c. 92.8 dB b. 88.0 dB d. 95.0 dB
The lithosphere rides on top of the asthenosphere. Lithospheric movement causes
A) earthquakes, volcanic activity, and mountain building activity. B) the subduction of continental crust under oceanic crust. C) hot-spot activity as found in Hawaii. D) widespread destruction.
A note is being played on a string on a guitar. The string is then pushed to the side while still in contact with the same fret. What happens to the frequency of the note then played compared to the original note?
a. It is the same note since the same fret is being used. b. It is at higher frequency than the original note. c. It is at lower frequency than the original note. d. It can be either higher of lower frequency depending on whether the original note was above or below middle C.
Ten parsecs is about
A) 150 million kilometers. B) 10,000 seconds. C) 10 parallax seconds of angle. D) 32.6 light-years.