Internal energy in a system can be changed by
a. doing work on the system. b. increasing the specific heat in the system.
c. changing the temperature of the system. d. transferring heat to/from the system.
a, d
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If a Carnot heat engine is run in reverse, it becomes
A. a heat engine with the smallest possible efficiency. B. a refrigerator. C. an engine that has a negative efficiency. D. nothing. It can't be run in reverse because to do so would violate the second law of thermodynamics.
The farthest galaxies that astronomers have seen are all elliptical galaxies
a. True b. False Indicate whether the statement is true or false
Resonance occurs when a 200-Hz tuning fork encounters a sound wave with a frequency of
A) 150 Hz. B) 200 Hz. C) 300 Hz. D) any of the above E) none of the above
The helium flash stage will always completely destroy a star and any planets nearby it
a. True b. False Indicate whether the statement is true or false