Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 14, Problem 4E
What do we mean by primitive material? How can we tell if a meteorite is primitive?
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How many impacts would you expect to strike a 100m2 region in one hour during Earth’s formation, assuming that Earth grew to its present size in 10 million years from particles averaging 100 grams each? (Hint: Assume that Earth had its current radius of 6378km.) (Notes: The surface area of a sphere is 4pir2 ; 1yr=3.2x107 .)
a. About 1300.
b. About 13 .
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2GM
; remember to convert units to m, kg, and s.)
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e
m/s
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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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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, physics and related others by exploring similar questions and additional content below.Similar questions
- Consider the differentiated meteorites. We think the irons are from the cores, the stony-irons are from the interfaces between mantles and cores, and the stones are from the mantles of their differentiated parent bodies. If these parent bodies were like Earth, what fraction of the meteorites would you expect to consist of irons, stony-irons, and stones? Is this consistent with the observed numbers of each? (Hint: You will need to look up what percent of the volume of Earth is taken up by its core, mantle, and crust.)arrow_forwardWhat does the cosmic ray exposure age tell us about the history of a meteorite?arrow_forwardThe Solar Nebula model introduces the concept of ‘frost line’. Where are asteroids and comets found with respect to this frost line? How is their location connected to their composition?arrow_forward
- Why is it more useful to classify meteorites according to whether they are primitive or differentiated rather than whether they are stones, irons, or stony-irons?arrow_forwardWhich meteorites are the most useful for defining the age of the solar system? Why?arrow_forwardIn what ways are meteorites different from meteors? What is the probable origin of each?arrow_forward
- a) What are the characteristics of a terrestrial planet? b) What are the characteristics of aJovian planet?arrow_forwardDescribe the relationship between meteor showers and comets. Why do meteor showers occur about on the same day each year?arrow_forwardO e. as a moon QUESTION 3 You observe a large, round object orbiting Uranus. How would you classify this object? O a. as a planet Ob. as a dwarf planet Oc. as an asteroid Od. as a Kuiper belt object e. as a moon QUESTION 4 What is one difference between asteroids and Kuipter Belt Objects (KBOS)? O a. asteroids are composed of rock and ice, while KBOS are composed of just rock b. asteroids orbit the Sun, while KBOS orbit Pluto C. asteroids orbit between Mars and Jupiter, while KBO's orbit near Pluto d. asteroids have very elliptical orbits, while KBOS have very circular orbits e. asteroids are small and potato-shaped, while KBOS are large and round DO000arrow_forward
- Originally thought to be the realm of comets, over the past two decades we discovered that the Kuiper Belt region hosts also many other objects similar in size to Pluto (Figure 22). This seems to imply that there are two completely different types of objects in the region. Do you think that both types of objects formed in this region, or some of these may have migrated to this region at a later time? Briefly explain your reasoning.arrow_forwardWhat methods do scientists use to distinguish a meteorite from terrestrial material?arrow_forwardExplain why the planet Venus is differentiated, but asteroid Fraknoi, a very boring and small member of the asteroid belt, is not.arrow_forward
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