Which Big Bang "puzzles" does the inflationary model resolve?
A. The cosmic background radiation is smooth, but the distribution of matter in the Universe is lumpy.
B. The energy of expansion is almost exactly equal to the collective gravitational force between galaxies.
C. The Universe is all ordinary matter with almost no antimatter.
D. All of these choices are correct.
Answer: A
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The__________is the fate of the Universe if dark energy increases with time and galaxies, stars, and even atoms are eventually pulled apart by the accelerating expansion of the Universe
A) big bang B) big dipper C) big collision D) big rip
Pressure: The weight of a 1200-kg car is supported equally by the four tires, which are inflated to the same gauge pressure. What gauge pressure is required so the area of contact of each tire with the road is 100 cm2?
A. 12 × 105 Pa B. 12 × 104 Pa C. 2.9 × 105 Pa D. 2.9 × 104 Pa
Human damage is usually highest for radiation by
A) beta particles. B) alpha particles. C) either of the above D) none of the above
Estimation: Which of the following is the most reasonable estimate of the number of characters (typed letters or numbers) in a 609-page book? Assume an average of 194 words per page and a reasonable average number of letters per word.
A. 5 × 105 char B. 5 × 107 char C. 5 × 106 char D. 5 × 104 char