In the color wheel shown below, which colors are the secondary colors?
A. red, yellow, blue
B. orange, green, purple
C. green, blue, purple
D. yellow, orange, red
Answer: B
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The eighteenth-century naturalist Carolus Linnaeus is known for creating:
a. the theory of natural selection b. a system for naming and classifying organisms c. the biological species concept d. the first microscope e. the scientific method
A quasar's spectrum is hugely redshifted. What do most astronomers think this large redshift tells us about the quasar?
A) the composition of the quasar B) the distance to the quasar C) the size of the quasar's central, supermassive black hole D) the type of host galaxy in which the quasar resides
What is the likely reason that we cannot find any examples of the first generation stars?
A) The first generation stars are too faint to be visible now. B) The first generation stars formed such a long time ago that the light from them has not yet had time to reach us. C) The first generation stars were all very massive and exploded as supernova. D) The first generation stars formed with only H and He and therefore have no spectral features. E) We do not know how the first generation stars were formed.
A rock is projected upward from the surface of the Moon, at time t = 0 s, with an upward velocity of 30.0 m/s. The acceleration due to gravity at the surface of the Moon is 1.62 m/s2, and the Moon has no atmosphere
The height of the rock when it is descending with a speed of 20.0 m/s is closest to A) 115 m. B) 125 m. C) 135 m. D) 145 m. E) 154 m.