All forms of energy are equivalent in terms of doing useful work
What will be an ideal response?
This is not true. We have seen that the quality of the energy is not the same.
Electrical energy can all be converted to useful work, but thermal energy cannot. We have
seen that thermal engines operate between temperature reservoirs and that thermal energy is
taken from the high temperature reservoir, work is done, and thermal energy is exhausted to
the low temperature reservoir. The energy rejected to the low temperature reservoir cannot
be used to do work.
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What would happen to Jupiter if we could somehow double its mass?
A) Its density would increase, but its diameter would barely change. B) Its density would decrease and its diameter would double. C) Its density would stay about the same and its volume would double. D) It would become a star, with nuclear fusion in its core.
Most spiral galaxies have rotation curves that
A) decrease rapidly with increasing radius in the disk, indicating no dark matter is present. B) increase drastically with increasing radius. C) decrease rapidly with increasing radius in the disk, indicating the presence of dark matter. D) stay constant out to large radii in the disk, indicating that no dark matter is present. E) stay constant out to large radii in the disk, indicating the presence of dark matter.
A temperature of degrees 290 Fahrenheit is equivalent to _____ degrees Celsius
a. 62.6 b. 554.0 c. 143.3 d. 17.0
The purpose of the moderator in a reactor is to
A. separate the nuclear fuel from the spent products of fission. B. provide cooling for the control rods. C. reduce the number of neutrons available for the chain reaction. D. slow neutrons down so that they will be more likely to initiate fission reactions.