Astronomy
1st Edition
ISBN: 9781938168284
Author: Andrew Fraknoi; David Morrison; Sidney C. Wolff
Publisher: OpenStax
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Textbook Question
Chapter 7, Problem 32E
Calculate the density of Saturn. Show your work. How does it compare with the density of water? Explain how this can be.
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For the following questions, use the data found in Appendix D.
Calculate the mass (in kg) of the Sun based on data for Uranus's orbit. (Use
G = 6.67 ✕ 10−11 N · m2/kg2
in your calculations. Round your answer to at least four significant figures.)
?_____kg
Compare the above calculated value with the Sun's actual mass. (Round your answer to at least three decimal places.)
mcalculated
mactual
= ?_______
What is the angular diameter of Saturn (in arc seconds) as seen from Earth when the two planets are closest together?
Hint: Use the small-angle formula
Density is mass per unit volume. Granite rock weighs about 2.7 g/cm3, water weighs about 1.0 g/cm3. Knowing their sizes, how might you determine whether Europa or Ganymede is hiding a large liquid water ocean beneath an icy crust?
Chapter 7 Solutions
Astronomy
Ch. 7 - Venus rotates backward and Uranus and Pluto spin...Ch. 7 - What is the difference between a differentiated...Ch. 7 - What does a planet need in order to retain an...Ch. 7 - Which type of planets have the most moons? Where...Ch. 7 - What is the difference between a meteor and a...Ch. 7 - Explain our ideas about why the terrestrial...Ch. 7 - Do all planetary systems look the same as our own?Ch. 7 - What is comparative planetology and why is it...Ch. 7 - What changed in our understanding of the Moon and...Ch. 7 - If Earth was to be hit by an extraterrestrial...
Ch. 7 - List some reasons that the study of the planets...Ch. 7 - Imagine you are a travel agent in the next...Ch. 7 - What characteristics do the worlds in our solar...Ch. 7 - How do terrestrial and giant planets differ? List...Ch. 7 - Why are there so many craters on the Moon and so...Ch. 7 - How do asteroids and comets differ?Ch. 7 - How and why is Earth’s Moon different from the...Ch. 7 - Where would you look for some “original”...Ch. 7 - Describe how we use radioactive elements and their...Ch. 7 - What was the solar nebula like? Why did the Sun...Ch. 7 - What can we learn about the formation of our solar...Ch. 7 - Earlier in this chapter, we modeled the solar...Ch. 7 - Seasons are a result of the inclination of a...Ch. 7 - Again using Appendix F, which planet(s) might you...Ch. 7 - Again using Appendix F, which planets might you...Ch. 7 - Using some of the astronomical resources in your...Ch. 7 - Explain why the planet Venus is differentiated,...Ch. 7 - Would you expect as many impact craters per unit...Ch. 7 - Using Appendix G, complete the following table...Ch. 7 - Calculate the density of Jupiter. Show your work....Ch. 7 - Calculate the density of Saturn. Show your work....Ch. 7 - What is the density of Jupiter’s moon Europa (see...Ch. 7 - Look at Appendix F and Appendix G and indicate the...Ch. 7 - Barnard’s Star, the second closest star to us, is...Ch. 7 - A radioactive nucleus has a half-life of 5108...
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- What is the density of Jupiter’s moon Europa (see Appendix G for data on moons)? Show your work.arrow_forwardDescribe the different processes that lead to substantial internal heat sources for Jupiter and Saturn. Since these two objects generate much of their energy internally, should they be called stars instead of planets? Justify your answer.arrow_forwardUsing Appendix G, complete the following table that describes the characteristics of the Galilean moons of Jupiter, starting from Jupiter and moving outward in distance. Table A This system has often been described as a mini solar system. Why might this be so? If Jupiter were to represent the Sun and the Galilean moons represented planets, which moons could be considered more terrestrial in nature and which ones more like gas/ice giants? Why? (Hint: Use the values in your table to help explain your categorization.)arrow_forward
- Calculate the radius of Jupiters Roche limit for a satellite with density equal to the planet. Which of Jupiters moons is closest to the Roche limit? What might that tell you about the relationship between that moon and Jupiters ring? (Note: Necessary data are given in Celestial Profile: Jupiter and Appendix Table A-11.)arrow_forwardUse the information in Appendix G to calculate what you would weigh on Titan, Io, and Uranus’ moon Miranda.arrow_forwardCalculate the density of Jupiter. Show your work. Is it more or less dense than Earth? Why?arrow_forward
- Describe the location of the equinoxes and solstices in the Uranian sky. What are the seasons like on Uranus?arrow_forwardThe ions in the inner parts of Jupiter’s magnetosphere rotate with the same period as Jupiter. Calculate how fast they are moving at the orbit of Jupiter’s moon Io (see Appendix G). Will these ions strike Io from behind or in front as it moves about Jupiter?arrow_forwardDescribe and compare the rings of Saturn and Uranus, including their possible origins.arrow_forward
- Calculate the mass of Callisto using a value for its density of 1.8 g/cm3. Convert your answer to units of kg, and compare to the mass of Ganymede given in Problem 5. (Notes: Density is mass divided by volume, and the volume of a sphere is 43r3. Necessary data are given in Appendix Table A-11.) 4. What is the escape velocity from the surface of Ganymede? Ganymedes mass is 1.5 1023 kg and its radius is 2.6 103 km. (Hint: Use the formula for escape velocity, Eq. 5-1b. The formula requires input quantities in kg and m.)arrow_forwardAt what average distances (in AU) from the Sun would you expect to find Kirkwood gaps where the orbital period of asteroids are respectively four-ninths, and three-sevenths, of the orbital period of Jupiter? (Hint: use Kepler's third law.) inner gap at_______ AU outer gap at_______ AUarrow_forwardDescribe the composition of Saturn from its center outward. What causes these different internal layers?arrow_forward
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