Electrons that are energized to glow in the filament of a common ac lamp are
A) supplied by a wall outlet.
B) supplied by a wall outlet, which in turn are supplied by your power company.
C) electrons already in the filament.
D) none of the above
Answer: C
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What condition is necessary in an interstellar gas cloud for it to begin collapsing?
A) a low density B) a low temperature C) a high temperature D) a high heavy element content E) a low heavy element content
What causes the long tail to protrude from this galaxy?
A: A supernova explosion blew material out in that direction. B: The galaxy is moving so fast through space that it's leaving a trail of heavier matter behind. C: A unique and yet unexplained phenomenon creates an anti-gravity effect that's pushing stars out of the galaxy. D: Tidal forces caused by interaction with another galaxy are drawing the material off. E: An incredibly powerful extraterrestrial civilization is reshaping the galaxy to suit its tastes.
Objects in the Kuiper belt
A) are in random orbits at all inclinations to the ecliptic. B) are the sources of long-period comets. C) lie beyond the orbit of Neptune, and close to the ecliptic. D) are dense, like the iron meteorites. E) lie beyond the orbit of Neptune and perpendicular to the ecliptic.