Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Question
Chapter 15, Problem 37Q
To determine
The reason due to which the phrase “dirty snowball” is an appropriate characterization of a comet’s nucleus.
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Calculate the orbital period of a comet nucleus in the Oort cloud.
For the following, determine whether the type of explanation offered is theoretical (the kind used in inference to the best explanation) or nontheoretical (e.g., teleological, interpretive, procedural).
No one noticed the comet before because of cloud cover.
Chapter 15 Solutions
Universe
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- Refer to Example 13.1. How would the calculation change if a typical comet in the Oort cloud is only 1 km in diameter?arrow_forwardRefer to Example 13.1. How would the calculation change if a typical comet in the Oort cloud is larger-say, 50 km in diameter?arrow_forwardIf the velocity of the solar wind is about 4.0 102 km/s and the visible tail of a comet is 1.0 108 km long, how many days does an atom in the solar wind take to travel from the nucleus to the end of the visible tail? (Nate: 1 day = 86,400 seconds.)arrow_forward
- What is the difference between a comets dust tail and a comets gas tail? What does that tell you about the composition and origin of comets?arrow_forwardSuppose a new primitive meteorite is discovered (sometime after it falls in a field of soybeans) and analysis reveals that it contains a trace of amino acids, all of which show the same rotational symmetry (unlike the Murchison meteorite). What might you conclude from this finding?arrow_forwardDescribe the nucleus of a typical comet and compare it with an asteroid of similar size.arrow_forward
- How do the risks of dying from the impact of an asteroid or comet compare with other risks we are concerned about, such as dying in a car accident or from heart disease or some other natural cause? (Hint: To find the annual risk, go to the library or internet and look up the annual number of deaths from a particular cause in a particular country, and then divide by the population of that country.)arrow_forwardIf a single asteroid 1 km in diameter were to be fragmented into meteoroids 1 m in diameter, how many would it yield? (Hint: The volume of a sphere 43r3 )arrow_forwardWhat is the orbital period of a comet nucleus at the inner edge of the Oort Cloud? What is its orbital velocity? Assume a circular orbit. (Hint: Use Keplers third law, Eq. 4-1) (Note: The circumference of a circle is 2r.)arrow_forward
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