The distribution of the dark matter in a spiral galaxy is
A) flattened in a disk but about ten times larger than the stellar disk.
B) flattened in a disk and about the same size as the stellar disk.
C) approximately spherical and about ten times the size of the galaxy halo.
D) predominantly concentrated in the spiral arms.
E) approximately spherical and about the same size as the galaxy halo.
C
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Studies by the Global Oscillations Network Group, along with satellite observations, indicate:
A) that the standard solar model requires substantial modification. B) that all stars show the same kind of vibrations that our Sun does. C) that there is an unknown energy transport mechanism in the Sun. D) that there is less convection in the Sun than predicted by the standard solar model. E) that the standard solar model accurately models the observed solar vibrations.
The significance of a Carnot engine is that
A. all automobiles operate on the Carnot cycle B. it has the maximum possible efficiency of any engine operating between the same two temperatures C. it violates the second law of thermodynamics D. it violates the first law of thermodynamics
A triatomic molecule is oriented as follows along the x-axis: mass m is at the origin, mass 2m is at x = a, and, mass 3m is at x = 2a. What is the moment of inertia of this molecule about the y-axis?
A) 2ma2 B) 3ma2 C) 12ma2 D) 14ma2
Which of these forms of radiation passes most easily through the disk of the Milky Way?
A. red light B. blue light C. infrared light