Cuesta College, San Luis Obispo, CA
The following was posted on Facebook[*]:
Brandy V.: So, this...was my first "dark" run with [my dog] Lilly in tow. She was easy to watch...with the [light from the waning gibbous] moon.Discuss a specific plausible range of times for this person's first "dark" run with her dog. Support your answer using a diagram showing the positions of the sun, the moon, Earth, and an observer on Earth.
[*] Posted September 4, 2012, facebook.com.
Solution and grading rubric:
- p:
Correct. The waning gibbous moon is highest overhead at 3:00 AM, and would have risen six hours before at 9:00 PM, and set six hours later at 9:00 AM. For the skies to be still be dark for Brandy V.'s run would mean any time between 9:00 PM and just before sunrise at 6:00 AM. Complete diagram and reasoning. - r:
Nearly correct (explanation weak, unclear or only nearly complete); includes extraneous/tangential information; or has minor errors. - t:
Contains right ideas, but discussion is unclear/incomplete or contains major errors. May have plausible times for waxing gibbous or waning crescent "dark" run. - v:
Limited relevant discussion of supporting evidence of at least some merit, but in an inconsistent or unclear manner. Diagram and discussion problematic. - x:
Implementation/application of ideas, but credit given for effort rather than merit. Misconceptions or non-relevant concepts: moon phases created by Earth's shadow, diagrams with the moon orbiting the sun, etc. - y:
Irrelevant discussion/effectively blank. - z:
Blank.
Section 70158
Exam code: midterm1s73W
p: 44 students
r: 0 students
t: 3 students
v: 1 student
x: 2 students
y: 0 students
z: 0 students
Section 70160
Exam code: midterm1N1t3
p: 20 students
r: 0 students
t: 6 students
v: 0 students
x: 3 students
y: 0 students
z: 0 students
A sample "p" response (from student 0304):
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