We do not know for certain whether the general trends we observe in stellar birth masses also apply to brown dwarfs. But if they do, then which of the following would be true?
A) Brown dwarfs would outnumber all ordinary stars.
B) Brown dwarfs would be responsible for most of the overall luminosity of our Milky Way Galaxy.
C) Brown dwarfs would be extremely rare.
D) Most of the brown dwarfs in the Milky Way Galaxy would be quite young in age.
A) Brown dwarfs would outnumber all ordinary stars.
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Why did scientists expect that the nucleus contained more than just protons?
a. By symmetry arguments about protons. b. Because nuclei have about half as many mass units as can be explained by the amount of their positive charge. c. Because without the negative charge of the neutron, electric repulsion between the positively charged protons would tear the nucleus apart. d. Because nuclei have less mass than could be accounted for by the amount of their positive charge. e. Because nuclei have approximately twice as many mass units as can be explained by the amount of their positive charge.
How many electrons are necessary to produce 1.0 C of negative charge? (e = 1.60 × 10-19 C)
A) 1.6 × 109 B) 6.0 × 1023 C) 6.3 × 1018 D) 6.3 × 109 E) 1.6 × 1019
You are a passenger on a spaceship. As the speed of the spaceship increases, you will observe
A) your watch slowing down. B) your watch speeding up. C) your watch losing time. D) your watch gaining time. E) nothing unusual about the behavior of your watch.
When current is flowing in a superconductor, which statement is not true?
a. The resistance is zero. b. No power is given off in the form of heat. c. A battery is needed to keep the current going. d. Electrical charges are moving.