Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 14, Problem 21E
How long would material take to go around if the solar nebula in Example 14.1 became the size of Earth’s orbit?
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I need help with this problem and an explanation of why its the answer described below:
(g = 9.03 m/s^2 is the answer but I need an explanations as to why it's the answer.)
9) An interstellar cloud fragment 0.2 light-year in diameter is rotating at a rate of one revolution per million years. It
now begins to collapse. Assuming that the mass remains constant, estimate the cloud's rotation period when it has
shrunk to (a) the size of the solar nebula, 100 AU across, and (b) the size of Earth's orbit, 2 AU across.
(answers: 0.016 revolutions per year, and an orbital period of 62.5 years,
This is 40 revolutions per year, and an orbital period of 0.025 years, or just a little over 9 days)
Consider the attached light curve for a transiting planet observed by the Kepler mission. If the host star is identical to the sun, what is the radius of
this planet? Give your answer in terms of the radius of Jupiter.
Brightness of Star
Residual Flux
0.99
0.98
0.97
0.006
0.002
0.000
-8-881
-0.06
-0.04
-0.02
0.00
Time (days) →
0.02
0.04
0.06
Chapter 14 Solutions
Astronomy
Ch. 14 - A friend of yours who has not taken astronomy sees...Ch. 14 - In what ways are meteorites different from...Ch. 14 - How are comets related to meteor showers?Ch. 14 - What do we mean by primitive material? How can we...Ch. 14 - Describe the solar nebula, and outline the...Ch. 14 - Why do the giant planets and their moons have...Ch. 14 - How do the planets discovered so far around other...Ch. 14 - Explain the role of impacts in planetary...Ch. 14 - Why are some planets and moons more geologically...Ch. 14 - Summarize the origin and evolution of the...
Ch. 14 - Why do meteors in a meteor shower appear to come...Ch. 14 - What methods do scientists use to distinguish a...Ch. 14 - Why do iron meteorites represent a much higher...Ch. 14 - Why is it more useful to classify meteorites...Ch. 14 - Which meteorites are the most useful for defining...Ch. 14 - Suppose a new primitive meteorite is discovered...Ch. 14 - How do we know when the solar system formed?...Ch. 14 - We have seen how Mars can support greater...Ch. 14 - Present theory suggests that giant planets cannot...Ch. 14 - Why are meteorites of primitive material...Ch. 14 - How long would material take to go around if the...Ch. 14 - Consider the differentiated meteorites. We think...Ch. 14 - Estimate the maximum height of the mountains on a...
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- According to the solar nebula theory, why is there a common direction of revolution and rotation for most objects in the Solar System?arrow_forwardWhat characteristics do the worlds in our solar system have in common that lead astronomers to believe that they all formed from the same “mother cloud” (solar nebula)?arrow_forwardH5. A star with mass 1.05 M has a luminosity of 4.49 × 1026 W and effective temperature of 5700 K. It dims to 4.42 × 1026 W every 1.39 Earth days due to a transiting exoplanet. The duration of the transit reveals that the exoplanet orbits at a distance of 0.0617 AU. Based on this information, calculate the radius of the planet (expressed in Jupiter radii) and the minimum inclination of its orbit to our line of sight. Follow up observations of the star in part reveal that a spectral feature with a rest wavelength of 656 nm is redshifted by 1.41×10−3 nm with the same period as the observed transit. Assuming a circular orbit what can be inferred about the planet’s mass (expressed in Jupiter masses)?arrow_forward
- 2. What percentage of the mass of the solar nebula consisted of elements other than hydrogen and helium?arrow_forwardCompute the maximum value of gravity anomaly in µGal over a buried sphere from the following data: Radius of a sphere = 5 m Depth to centre of sphere =11 m Density contrast = 0.1 gm/cc G = 6.673x10^-8 dynecm^2/gm^2arrow_forwardExamine Table 18-2. What might a planets composition be if the planet formed in a region of the solar nebula where the temperature was about 1200 K?arrow_forward
- How do we know the age of the Sun?arrow_forwardIf the Orion Nebula is 8 pc in diameter and has a density of about 6.0 108 hydrogen atoms/m3, what is its total mass? (Notes: The volume of a sphere is 43r3; 1 pc = 3.1 1016 m; the mass of a hydrogen atom is 1.7 1027 kg.)arrow_forwardDo all planetary systems look the same as our own?arrow_forward
- What evidence can you give that the Solar System formed about 4.6 billion years ago?arrow_forwardWhat is the difference between a differentiated body and an undifferentiated body, and how might that influence a body’s ability to retain heat for the age of the solar system?arrow_forwardDid hydrogen gas condense from the nebula as the nebula cooled? What about helium gas? How do you know?arrow_forward
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