When you adjust a telescope to get a clear image of Saturn's rings, there is a perceptible interaction between
A) you and the telescope.
B) you and Saturn's rings.
C) both of these
D) neither these
Answer: A
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Suppose that Earth's atmosphere had no greenhouse gases. Then Earth's average surface temperature would be ________
A) well below the freezing point of water B) slightly cooler, but still above freezing C) slightly warmer, but still well below the boiling point of water D) about the same as it is now
Electric fields that arise from changing magnetic fields have all the properties below except:
A. They terminate on electric charges. B. They cannot be described by an electric potential. C. Their field lines take the form of closed loops. D. Work done by the field along a closed path may be non-zero.
What are the standard time and date (time of day and day of month) in Kyoto, Japan (135°E, 35°N), when it is 11 A.M. EST on March 10 in Washington, D.C. (39°N, 77°W)?
What is meant by "dark energy"?
A) the energy associated with dark matter through E=mc2 B) any unknown force that opposes gravity C) the repulsive agent causing the universal expansion to accelerate D) highly energetic particles that are believed to constitute dark matter E) the total energy in the Universe after the Big Bang but before the first stars