Universe
11th Edition
ISBN: 9781319039448
Author: Robert Geller, Roger Freedman, William J. Kaufmann
Publisher: W. H. Freeman
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Chapter 15, Problem 6Q
To determine
The reason for referring to Ceres as the smallest dwarf planet instead of the largest asteroid. Mention the advantages and disadvantages of this scheme.
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The asteroid Hygiea has a mass of 8.67 x 1019 kg and an average radius of about 216 km (2.16 x 102 km). What is its escape velocity (in m/s)? (Hints: Use the formula for escape velocity,
2GM
; remember to convert units to m, kg, and s.)
r
e
m/s
Could you jump off the asteroid?
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a) What are the characteristics of a terrestrial planet? b) What are the characteristics of aJovian planet?
Calculate the escape velocity from the surface of the asteroid Ceres (mass of about 10^(21) kg and radius of about 475 km). Could you run fast enough to escape Ceres' gravity?
How about driving?
Chapter 15 Solutions
Universe
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- Explain why the planet Venus is differentiated, but asteroid Fraknoi, a very boring and small member of the asteroid belt, is not.arrow_forwardWhy is Pluto not considered a major planet, and what other peculiarity distinguishes it from the major planets?arrow_forwardCompare Titan to Rhea. Estimate the strength of surface gravity on Titan compared to the gravity on Titan. How does this affect the possibility of an atmosphere on each? Use g=GM/R2 Titan Radius: 2,575 km, Mass: 2.31 x 1021 kg Rhea Radius: 764 km, Mass: 1.35 x 1023 kgarrow_forward
- List at least three major differences between Pluto and the terrestrial planets.arrow_forwardHow are Triton and Pluto similar?arrow_forwardCompare the interior cutaway sketches of the four Jovian planets in their Celestial Profiles. What interior layer(s) is (are) shown in Jupiter and Saturn but not in Uranus and Neptune, and vice versa?arrow_forward
- We believe that chains of comet fragments like Comet Shoemaker-Levy 9’s have collided not only with the jovian planets, but occasionally with their moons. What sort of features would you look for on the outer planet moons to find evidence of such collisions? (As an extra bonus, can you find any images of such features on a moon like Callisto? You can use an online site of planetary images, such as the Planetary Photojournal, at photojournal.jpl.nasa.gov.)arrow_forwardHow was Pluto discovered? Why did it take so long to find it?arrow_forwardCalculate 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_forward
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