Sustained energy output by fusion is a daily occurrence in
A) military installations.
B) breeder reactors.
C) the Sun.
D) Earth's interior.
Answer: C
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Is it possible for each of three stationary charged particles to exert a force of attraction on the other two?
1.yes 2.no
The plane in which almost all planets orbit the Sun is called the
A) equator of the solar system. B) ecliptic. C) equant. D) node. E) galactic plane.
The amplitude of a system moving with simple harmonic motion is doubled. The total energy will then be
a. 4 times as large b. 3 times as large c. 2 times as large d. the same as it was e. half as much
Suppose you repeated the famous COBE and Planck observations of the cosmic microwave background, with a slight different observational setup, to check their results. Which of the following observations would be surprising and contradict earlier findings?
A) You find that cosmic microwave background has a temperature of 2.73 K. B) You find that cosmic microwave background has an almost perfect thermal spectrum. C) You find that cosmic microwave background contains redshifted emission lines of hydrogen and helium. D) You find that cosmic microwave background looks essentially the same in all directions. E) You find that cosmic microwave background has tiny temperature fluctuations at the level of about 1 part in 100,000.