Homework week 6
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Feb 20, 2024
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PHY 21430 Frontiers in Astronomy
Homework - Week 6
Instructions: Replace the Text in Orange with your answers. You can take up as much space as needed to answer, but please keep your answer colored orange to make it easier to grade. Upload your solutions to the Assignment in Blackboard. Most answers require one or two sentences. Here is some physical data of the Jovian planets.
Planet
Distance
(AU)
Period
(years)
Diameter
(km)
Mass
(Earth = 1)
Density
(g/cm
3
)
Rotation
(hours)
Tilt of axis
(degrees)
Jupiter
5.2
11.9
142,800
318
1.3
9.9
3
Saturn
9.5
29.5
120,540
95
0.7
10.7
27
Uranus
19.2
84.1
51,200
14
1.3
17.2
98
Neptune
30.0
164.8
49,500
17
1.6
16.1
29
Table 11. 1 (adapted from openstax textbook)
1.
(4 pts) Look up the density of the Earth in g/cm
3
. How does the density of the Jovian planets compare to the density of the Earth? What does this tell us about their composition?
Type your answer here. 2.
(4 pts) Explain why is it difficult to determine the rotational speed of the Jovian planets visually? What property is used to determine the correct periods. (Note it is the same property for all of them.)
Type your answer here. 3.
(5 pts) What are the seasons like on Jupiter? Are they different from the seasons on Saturn? (Hint: Think about what property of the Earth’s motion is responsible for seasons on Earth.)
Type your answer here.
PHY 21430 Frontiers in Astronomy
4.
(4 pts) Why do rings form relatively close to the Jovian planets and their moons are found farther away?
Type your answer here. 5.
(4 pts) The wind patterns of the Jovian planets are shown below. Compare the atmospheric circulation (weather) of these planets.
Figure 11.17
Winds on the Giant Planets.
This image compares the winds of the giant planets, illustrating that wind speed (shown on the horizontal axis) and wind direction vary with latitude (shown on the vertical axis). Winds are measured relative
to a planet’s internal rotation speed. A positive velocity means that the winds are blowing in the same direction as, but faster than, the planet’s internal rotation. A negative velocity means that the winds are blowing more slowly than the planet’s internal rotation. (From openstax text.)
Type your answer here. 6.
(4 pts) Where do comets visible from Earth typically originate? What is the eventual fate of these comets?
Type your answer here.
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