One piece of evidence supporting the theory of cosmic inflation is
A) the observed fact that the geometry of the universe is "flat.".
B) the fact that neutrinos are now known to have no rest mass.
C) the fact that neutrinos have been found to have rest mass.
D) the observed fact that the temperature of the cosmic background radiation is now about 4 Kelvin.
E) the observed fact that the geometry of the universe is "open."
A
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The gas and dust in the disk of the Milky Way amount to approximately ________ of the mass of the stars.
A. 50% B. 15% C. 90% D. 30%
The fresh newly created surfaces of icy satellites of Jovian planets
a. appear dark in color with few impact craters. b. appear dark in color with many impact craters. c. appear very bright because fresh ice is very reflective. d. generally show long bright grooves and a modest number of impact craters. e. generally have small volcanoes that are active.
Why is there a two-day difference in the sidereal and synodic months?
A) The Moon speeds up at perigee, and slows down at apogee. B) The sidereal day is four minutes shorter than the solar day, and it adds up. C) The Earth is closer to the Sun during the sidereal month. D) The Earth is also revolving around the Sun, so the Moon must "catch up." E) The Moslem lunar year is only 354 days long, on average.
A 6.00-kg block starts from rest and slides down a frictionless incline. When the block has slid a distance 2.00 m, its speed is 3.00 m/s. At what angle above horizontal is the inclined plane tilted?
A) 6.58° B) 27.3° C) 8.80° D) 5.26° E) 13.3°