Horizons: Exploring the Universe (MindTap Course List)
14th Edition
ISBN: 9781305960961
Author: Michael A. Seeds, Dana Backman
Publisher: Cengage Learning
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Textbook Question
Chapter 14, Problem 1RQ
How does the darkness of the night sky tell you something import ant about the Universe?
Expert Solution & Answer
To determine
To explain the darkness of the night sky, provide what important information about universe.
Explanation of Solution
Introduction:
If we look in any direction in the night sky our line of sight ends at surface of stars. Similarly, our universe is isotropic it looks similar in all directions. It is filled with stars.
According to cosmological theory our universe is not infinitely old and static. If we explore the night sky more distant stars are far away from us. Their star light is unable to reach us because of inverse square law their brightness decreases. In the same way if we look in the past to predict the beginning of the universe we see the time before the first star is formed.
Conclusion:
The darkness of star shows that the universe is not infinitely old it came into existence from some finite time in the past.
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A Van de Graff generator, if the metal sphere on the Van de Graff has a charge of 0.14 Coulombs and the person has a mass of 62 kg, how much excess charge would the person need in order to levitate at a distance 25 cm from the center of the charged metal sphere? Assume you can treat both the person and the metal sphere as point charges a distance 25 cm from each other using Coulomb's Law to calculate the electrical force.
Give your answer as the number of Coulombs
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43. A mass må undergoes circular
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FIGURE 5.33 Problem 43
Chapter 14 Solutions
Horizons: Exploring the Universe (MindTap Course List)
Ch. 14 - How does the darkness of the night sky tell you...Ch. 14 - How can Earth be located at the center of the...Ch. 14 - Prob. 3RQCh. 14 - Prob. 4RQCh. 14 - Why couldn’t atomic nuclei exist when the e of the...Ch. 14 - Why are measurements of the present density of the...Ch. 14 - Prob. 7RQCh. 14 - Prob. 8RQCh. 14 - What is the evidence that the Universe was very...Ch. 14 - Prob. 10RQ
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