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--- course_planning:183_projects:s23_week_3_geostationary_orbit [2023/01/25 20:10] – hallstein
+++ course_planning:183_projects:s23_week_3_geostationary_orbit [2023/01/25 20:53] – hallstein
@@ Line 198: / Line 198: @@
  * **Question:**  How can you prove that the orbit is actually circular?
-  * **Expected Answer:**
+  * **Expected Answer:**  Aside from just eyeballing it, we can add in a graph of the distance from the center of Earth!
-Aside from just eyeballing it, we can add in a graph of the distance from the center of Earth!
 Part C includes adding this graph:
@@ Line 216: / Line 215: @@
   * Groups should have developed a working code that models any gravitational orbit around the Earth and be able to explain what and how they did it.
-  * For groups that get through this part (it's tough for many groups), they should check that the orbit is circular and explain that and they should add arrows to represent different physical quantities (i.e., momentum of the satellite, etc.).
+  * For groups that get through this part (it's tough for many groups), they should check that the orbit is circular and explain that and they should add arrows to represent different physical quantities (i.e., the momentum of the satellite, etc.).
 </WRAP>
@@ Line 293: / Line 292: @@
 Inside the while loop, add: graphExample.plot(t, mEarth)
+<WRAP tip>
+== Tutor Questions ==
+  * **Question:** The plotted distance is varying with time.  Is this a concern?  WHy is this?
+  * **Expected Answer:**  It is not a concern.  We inputted given values to a couple of significant figures and the variations are just a small fraction of the distance...
+</WRAP>
 ====== Project 3: Part D: Geostationary orbit ======
@@ Line 298: / Line 305: @@
 On a single graph, plot both the x-component of the satellite's momentum and the x-component of the net force acting on the satellite.
+<WRAP tip>
+== Tutor Questions ==
+  * **Question:** Why does it seem as though the net force is zero?
+  * **Expected Answer:**  It looks that way because the size of the force plotted by Python is several orders of magnitude smaller than the size of the plotted momentum.  We fixed this by adding a scale and plotting the force in units of $10^4$ N
+  * **Question** From the plotted graph, what is the relationship between Fnet,x and p,x?
+  * **Expected Answer** When Fnet,x is at an extreme value, p,x is zero; when Fnet,x is zero, p,x is at an extreme value.
+</WRAP>
 Solution code for parts C and D