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Seeds - Horizons - Exploring the Universe 12/e (Homework)

James Finch

Astronomy, section 1, Fall 2019

Instructor: Dr. Friendly

Current Score : 1 / 9

Due : Monday, January 28, 2030 00:00 EST

Last Saved : n/a Saving...  ()

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Question
Points
1 2 3 4 5 6
–/3 1/1 –/1 –/1 –/1 –/2
Total
1/9 (11.1%)

  • Instructions

    In this assignment you will see several of the question types found in Horizons - Exploring the Universe 12e by Michael A. Seeds and Dana Backman published by Brooks/Cole Publishing.

    Question 1 is an assignable Active Figure question (AF).

    Question 2 is a Guidepost question (GP).

    Questions 3 and 4 are Problems (P).

    Question 5 is a Reading question (RE). Reading questions test for comprehension of the text material. Instructors can assign these questions as incentive to the students to keep up on the reading assignments.

    Question 6 is a Review Questions (RQ). This demo assignment allows many submissions and allows you to try another version of the same question for practice wherever the problem has randomized values.

Assignment Submission

For this assignment, you submit answers by question parts. The number of submissions remaining for each question part only changes if you submit or change the answer.

Assignment Scoring

Your last submission is used for your score.

1. –/3 points SeedsHorizons12 2.AF.002. My Notes
Question Part
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–/1 –/1 –/1
0/50 0/50 0/50
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–/3
 
Constellations from Different Latitudes

(a) From North America, looking south around 9PM in the summer, what constellation would you see?
    

(b) Viewing Centaurus and Vela from South America and then from Antarctica, what do their relative altitudes tell you about their Celestial Sphere coordinates?
    

(c) The sky views are all shown as they appear at 9PM in the summer. Which parameters are important to the positions of the constellations?
    
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2. 1/1 points  |  Previous Answers SeedsHorizons12 2.GP.XP.002. My Notes
Question Part
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1
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1/1
 
It is useful to model the sky as a celestial sphere that rotates around Earth from east to west once per day. Based on what you learned about the motions of the sky, select all of the correct statements from the following list.
Correct: Your answer is correct.

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3. –/1 points SeedsHorizons12 2.P.XP.002. My Notes
Question Part
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1
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–/1
 
If two stars differ by 9 magnitudes, what is their intensity ratio?
:1
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4. –/1 points SeedsHorizons12 2.P.004. My Notes
Question Part
Points
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1
–/1
0/50
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–/1
 
By what factor is the sun brighter than the full moon? (Hint: See Figure 2-6.)

Figure 2-6
times
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5. –/1 points SeedsHorizons12 2.RE.XP.009. My Notes
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1
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–/1
 
Notice in this figure that the magnitude scale is "awkward" in that the smaller, or more negative, magnitude number corresponds to a brighter star. Why does this scale have this "awkward" direction?
    

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6. –/2 points SeedsHorizons12 12.RQ.002. My Notes
Question Part
Points
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1 2
–/1 –/1
0/50 0/50
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–/2
 
(a) Why didn't astronomers realize at first how large the galaxy is?
    

(b) Who was the first astronomer to get a reasonable idea of the size and shape of the galaxy?
    
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