Large curved cooling towers can often be seen at
A) steam-electric power plants.
B) nuclear power plants.
C) Both of the above.
D) hydro-electric plants.
E) All of the above.
C
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What observational evidence supports the fact that our universe is static and unchanging?
a. Detection of the cosmic microwave background (CMB) b. Dark sky at night c. Redshift of galaxies d. Evolution of galaxies with distance e. None of the above
The total energy emitted by the brightest nova explosions is about:
A) 1,000 Suns. B) 50,000 Suns. C) a million Suns. D) a billion Suns. E) a trillion Suns.
A body moving in a circular path at constant speed exhibits acceleration because its ________ is changing.
Fill in the blank(s) with the appropriate word(s).
A shift in the position of an emission line of an element toward the red or blue is produced by ____
a. atoms that become ionized b. electrons that transfer from a high energy level to a low energy level c. electrons that transfer from a low energy level to a high energy level d. the intensity of agitation of atoms in a hot gas e. the motion of an object toward or away from the observer