In light of modern solar system theory, why do the orbits of the planets all lie in the same plane?
A) The Sun's gravity forced them into these orbits.
B) The angular momentum of the solar system was kept to a minimum this way.
C) The early solar nebula flattened into a disk.
D) Comets would have wiped out any not in this protected plane.
E) This happened purely by chance.
C
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A typical galaxy is a
A) collection of millions or billions of stars, bound together by gravity and orbiting a common center. B) large, glowing ball of gas powered by nuclear energy. C) nearby object orbiting a planet. D) relatively small, icy object orbiting a star. E) system consisting of one or a few stars orbited by planets, moons, and smaller objects.
What direct evidence has been obtained for the existence of dark matter in galaxy clusters?
What will be an ideal response?
A sinusoidally varying potential difference has amplitude 170 V. What is its minimum instantaneous value?
1.170 V 2.120 V 3.0 4.-120 V 5.-170 V
An electric field is produced by a
A) constant magnetic field. B) changing magnetic field. C) either a constant or a changing magnetic field. D) none of the given answers