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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The process of formation of the Solar System
a) involved the Sun forming from the collapse of a large planet. b) began about 10 million years ago. c) led to the formation of the most massive planets closest to the Sun and the least massivefarthest away. d) involved a spinning cloud of gas that remained spherical until after the planets andSun formed. e) took only a small fraction of the age of the Solar System.
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.
Which of the following statements best describes the quantum property spin?
A) Spin is a measure of the rotation rate of a subatomic particle. B) Spin is a measure of the rate at which a particle orbits another particle. C) Spin is a property that applies only to large objects, like baseballs. D) Spin is not meant to be taken literally, but measures the inherent angular momentum of a subatomic particle. E) Spin is not a fundamental property, but rather something that can change randomly at any time.
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