An object of mass m rests on a flat table. The earth pulls on this object, exerting a force of magnitude mg. What is the Newton's third law pair force to this pull?
A) The table pushing up on the object exerting the force mg.
B) The object pushing down on the table exerting the force mg.
C) The table pushing down on the floor exerting the force mg.
D) The object pulling upward on the Earth exerting the force mg.
E) The table pulling upward on the Earth exerting the force mg.
D
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The sun is on the celestial equator at the times of the
a. vernal equinox and the summer solstice. b. autumnal equinox and the vernal equinox. c. summer solstice and the winter solstice. d. autumnal equinox and the winter solstice. e. sun is on the ecliptic and is never on the celestial equator.
Density is
A) proportional to both mass and volume. B) proportional to mass and inversely proportional to volume. C) inversely proportional to mass and proportional to volume. D) inversely proportional to both mass and volume. E) proportional only to volume.
Venus has a high albedo because its surface is covered by
A) light-colored rocks. B) snow. C) clouds. D) dust storms. E) volcanic ash.
An astronaut goes out for a "space-walk" at a distance above the earth equal to the radius of the earth. What is her acceleration due to gravity at that point?
A) g B) g/ C) g/2 D) zero E) g/4