Shepherd moons were discovered because scientists hypothesized their existence after observing:
A) the Cassini Gap.
B) the spiral density waves in the ring system.
C) that the gaps are not empty space, but low density regions of material.
D) the narrow F Ring.
E) the backlit E Ring.
D
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Accretion is
a. the adding of material to an object an atom or molecule at a time. b. the adding of material to an object by collection of solid particles. c. the release of gas from rocks as they are heated. d. the largest of the Galilean satellites. e. caused by the bombardment of the solar wind.
What is this galaxy doing that keeps it from being idle?
A: The black hole at the center of the disk is sucking in the stars in the disk, which is gradually disappearing. B: It is fragmenting into different irregular parts as the universe evolves. C: It is oscillating between compressed and rarefied states, changing by a factor of two in size every million years. D: Stars are forming in the spiral arms and the disk is rotating. E: The galaxy evaporates quickly so that it will only be around for another million years.
Suppose you are out on a frozen lake, where there is no friction. Which of the following would start you moving towards the shore?
A. Removing a shoe and throwing it towards the shore B. Shouting at someone on the shore C. Removing a shoe and throwing it away from the shore D. None of these choices would work
The binding energy per nucleon of a nucleus
A) increases steadily as we go to heavier elements. B) is approximately constant throughout the periodic table, except for very light nuclei. C) has a maximum near iron in the periodic table and decreases after that for heavier elements. D) decreases steadily as we go to heavier elements. E) has a minimum near iron in the periodic table and increases after that for heavier elements.