How does the Sun's mass compare with that of the planets?
A) It is a hundred times more massive than all the planets combined.
B) It is a thousand times more massive than all the planets combined.
C) It is about as massive as all the planets combined.
D) It is a thousand times more massive than Earth.
E) It is a hundred times more massive than Earth.
B
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Observational evidence indicates that at least some gamma ray bursts are produced by
A) the supernovas of very massive stars that leave behind black holes. B) the central black hole of the Milky Way Galaxy. C) the same types of close binary systems that produce x-ray bursts. D) white dwarf supernovas in distant galaxies.
A lens with a focal length of 20 cm has what power?
a. 5.0 diopters b. 0.2 diopters c. 2 diopters d. –5.0 diopters e. 0.02 diopters
Center of Mass: The center of mass (or center of gravity) of a two-particle system is at the origin. One particle is located at (3.0 m, 0.0 m) and has a mass of 2.0 kg. The other particle has a mass of 3.0 kg. What is the location of the 3.0-kg particle?
A. (-3.0 m, 0.0 m) B. (-2.0 m, 0.0 m) C. (2.0 m, 0.0 m) D. (3.0 m, 0.0 m)
Approximately what proportion of people in the United States believe we have been visited by extraterrestrials?
A) around 33% or a third B) about 50% or a half C) less than 1% D) more than 90%