According to the theory of cosmic inflation, at what time in the history of the universe did inflation occur?
A) at the very beginning of the big bang
B) at the time that the cosmic background radiation formed
C) around the third or fourth minute
D) around the third or fourth second
E) at a tiny fraction of the first second, but not quite at the very beginning of the big bang
E
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Angular Momentum: A merry-go-round spins freely when Diego moves quickly to the center along a radius of the merry-go-round. As he does this, it is true to say that
A. the moment of inertia of the system decreases and the angular speed increases. B. the moment of inertia of the system decreases and the angular speed decreases. C. the moment of inertia of the system decreases and the angular speed remains the same. D. the moment of inertia of the system increases and the angular speed increases. E. the moment of inertia of the system increases and the angular speed decreases.
What causes the sun to "bob" up-and-down in its orbit around the galactic center?
A) gravitational attraction towards other nearby galaxies B) the localized pull of stars within the disk itself C) lack of friction with the low-density interstellar medium D) A and B E) B and C
Suppose a comet orbits the Sun on a highly eccentric orbit with an average (semimajor axis) distance of 1 AU. How long does it take to complete each orbit, and how do we know?
A) Each orbit takes about 1 year, which we know from Kepler's third law. B) It depends on the eccentricity of the orbit, as described by Kepler's first law. C) It depends on the eccentricity of the orbit, as described by Kepler's second law. D) Each orbit should take about 2 years, because the eccentricity is so large.
What is the study of cosmology?
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