Foundations of Astronomy, Enhanced
13th Edition
ISBN: 9781305980686
Author: Michael A. Seeds; Dana Backman
Publisher: Cengage Learning US
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Textbook Question
Chapter 24, Problem 20RQ
Why do you suspect that Triton had a geologically active past? What sources of energy could have powered such activity?
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Kirchoff's Laws. A circuit contains 3 known resistors, 2 known batteries, and 3 unknown currents as shown.
Assume the current flows through the circuit as shown (this is our initial guess, the actual currents may be
reverse). Use the sign convention that a potential drop is negative and a potential gain is positive.
E₂ = 8V
R₁₁ = 50
R₂ = 80
b
с
w
11
www
12
13
E₁ = 6V
R3 = 20
a) Apply Kirchoff's Loop Rule around loop abefa in the clockwise direction starting at point a. (2 pt).
b) Apply Kirchoff's Loop Rule around loop bcdeb in the clockwise direction starting at point b. (2 pt).
c) Apply Kirchoff's Junction Rule at junction b (1 pt).
d) Solve the above 3 equations for the unknown currents I1, 12, and 13 and specify the direction of the current
around each loop. (5 pts)
I1 =
A
12 =
A
13 =
A
Direction of current around loop abef
Direction of current around loop bcde
(CW or CCW)
(CW or CCW)
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4.) The diagram shows the electric field lines of a positively charged conducting sphere of
radius R and charge Q.
A
B
Points A and B are located on the same field line.
A proton is placed at A and released from rest. The magnitude of the work done by the electric field in
moving the proton from A to B is 1.7×10-16 J. Point A is at a distance of 5.0×10-2m from the centre of
the sphere. Point B is at a distance of 1.0×10-1 m from the centre of the sphere.
(a) Explain why the electric potential decreases from A to B. [2]
(b) Draw, on the axes, the variation of electric potential V with distance r from the centre of the
sphere.
R
[2]
(c(i)) Calculate the electric potential difference between points A and B. [1]
(c(ii)) Determine the charge Q of the sphere. [2]
(d) The concept of potential is also used in the context of gravitational fields. Suggest why scientists
developed a common terminology to describe different types of fields. [1]
Chapter 24 Solutions
Foundations of Astronomy, Enhanced
Ch. 24 - Why didnt ancient astronomers know of Uranuss...Ch. 24 - Describe the location of the equinoxes and...Ch. 24 - Prob. 3RQCh. 24 - Prob. 4RQCh. 24 - Why is belt-zone circulation difficult to detect...Ch. 24 - Prob. 6RQCh. 24 - Prob. 7RQCh. 24 - Describe four characteristics in common among all...Ch. 24 - Describe four differences between the two ice...Ch. 24 - Prob. 10RQ
Ch. 24 - What are hypotheses for the origin of the rings of...Ch. 24 - How do the characteristics of Uranuss and Neptunes...Ch. 24 - If Uranus and Neptune had no satellites at all,...Ch. 24 - Why might the surface brightness of ring particles...Ch. 24 - Both Uranus and Neptune have a blue-green tint...Ch. 24 - How are the atmospheres of Earth and Triton...Ch. 24 - Prob. 17RQCh. 24 - When Neptune was discovered, how was its position...Ch. 24 - How can small worlds like Triton and Pluto have...Ch. 24 - Why do you suspect that Triton had a geologically...Ch. 24 - If you visited the surface of Pluto and found...Ch. 24 - What evidence can you give that Pluto and Charon...Ch. 24 - Why was Pluto reclassified as a dwarf planet?Ch. 24 - How was the discovery of Neptune not accidental?Ch. 24 - Prob. 1DQCh. 24 - Suggest a single phenomenon that could explain the...Ch. 24 - Prob. 3DQCh. 24 - Prob. 4DQCh. 24 - Prob. 5DQCh. 24 - What is the maximum angular diameter of Uranus as...Ch. 24 - One way to recognize a distant planet is by...Ch. 24 - What is the orbital velocity of Miranda around...Ch. 24 - Calculate Uranuss Roche radius. Are all of Uranuss...Ch. 24 - Prob. 5PCh. 24 - What is the escape velocity from the surface of an...Ch. 24 - What is the difference in the orbital velocities...Ch. 24 - Repeat Problem 2 for Pluto. In other words,...Ch. 24 - Given the size of Tritons orbit (r = 355,000 km)...Ch. 24 - Prob. 1LTLCh. 24 - Prob. 2LTLCh. 24 - Compare the interior cutaway sketches of the four...Ch. 24 - Prob. 4LTLCh. 24 - Review Figure 21-11. Which molecules can Triton...Ch. 24 - The image to the left shows how Uranus would look...
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