The three space coordinates that determine a star's position are the
a. celestial sphere, celestial prime meridian, and celestial equator.
b. zodiac, constellation, and star name.
c. distance, declination, and right ascension.
d. astronomical unit, parsec, and light-year.
c
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A stationary firecracker explodes, breaking into two parts of equal mass. One part is moving north at 20 m/s. The velocity of the other part is
A) 20 m/s with a direction that's impossible to predict without more information. B) also northward at 20 m/s. C) impossible to predict without more information. D) zero. E) southward at 20 m/s.
Ehrenfeld (119) argues that nonresources should be conserved. By this he means that conservation cannot and should not rely on economic or ecological justifications
He thinks that each species on the Earth, evolved over millions of years, is natural art, and that a species lost is permanently gone. He asks: "What sort of change in the world view would favor the conservation of nonresources? Nothing less than a rejection of the heroic, Western ethic with its implicit denial of man's biological roots and evolved structure." Comment on Ehrenfeld's ideas.
The Big Dipper is
a. a circumpolar constellation for southern hemisphere observers. b. always on an observer's zenith. c. an asterism. d. only visible from the southern hemisphere. e. a constellation.
The gain in speed each second for a freely-falling object is about
A) 0 m/s. B) 5 m/s. C) 10 m/s. D) 20 m/s. E) depends on the initial speed.