In the context of the formation of planets in the solar nebula, the frost line marks the distance from the Sun beyond which
A) the temperature was low enough for hydrogen compounds to condense into ices.
B) the temperature was low enough for solid rock to condense from the gas.
C) hydrogen compounds were particularly abundant.
D) planets could be cold enough to have snow.
A) the temperature was low enough for hydrogen compounds to condense into ices.
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During a total solar eclipse, what part of the Sun is often visible that we normally cannot see?
a. core b. CMEs c. corona d. photosphere e. solar wind
Centripetal force does no work on a circularly-moving object because
A) no change in energy occurs. B) rotational energy transfers to kinetic energy. C) centripetal force has no component in the direction of motion. D) none of the above.
In photoelectric emission, the work function is the minimum
A) frequency of light to produce emission. B) energy required to eject an electron from the surface. C) energy an emitted electron possesses. D) none of the above
If a glass of water is on a table with a piece of paper under it, it is relatively easy to pull the paper out without disturbing the glass very much if the pull is done very quickly. This is because, with a quick pull:
a. the force on the glass will be less. b. the momentum of the paper will be greater. c. the time for the pull will be less. d. the coefficient of kinetic friction will be less.