Which of the following best describes why a white dwarf cannot have a mass greater than the 1.4-solar-mass limit?
A) Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4-solar-mass limit.
B) White dwarfs get hotter with increasing mass, and above the 1.4-solar-mass limit they would be so hot that even their electrons would melt.
C) White dwarfs are made only from stars that have masses less than the 1.4-solar-mass limit.
D) The upper limit to a white dwarf's mass is something we have learned from observations, but no one knows why this limit exists.
A) Electron degeneracy pressure depends on the speeds of electrons, which approach the speed of light as a white dwarf's mass approaches the 1.4-solar-mass limit.
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If VA?VB = 50 V, how much energy is stored in the 36-?F capacitor?
A. 50 mJ B. 28 mJ C. 13 mJ D. 8.9 mJ E. 17 mJ
If we are optimistic in our assumptions about the development of life and intelligence, then the number of technological civilizations currently in the galaxy should equal the
A) average lifetime of a civilization. B) number of stars in the galaxy's habitable zone. C) average number of planets per star. D) number of stars forming per year. E) average number of planets that produce life.