Cuesta College, San Luis Obispo, CA
Cf. Giambattista/Richardson/Richardson, Physics, 2/e, Problems 13.14, 13.15
A glass container is filled to the brim with a liquid when the system is at 40° C. After the system is cooled to 15° C, the liquid level is slightly below the top of the container. There are no phase changes. Which material (glass or liquid) has a larger coefficient of volume expansion? Explain your answer using the properties of temperature and thermal expansion.
Solution and grading rubric:
- p:
Correct. Argues that since liquid contracted more than the glass, then the liquid must have a greater volume expansion coefficient than the glass. - r:
As (p), but argument indirectly, weakly, or only by definition supports the statement to be proven, or has minor inconsistencies or loopholes. - t:
Nearly correct, but argument has conceptual errors, or is incomplete. - v:
Limited relevant discussion of supporting evidence of at least some merit, but in an inconsistent or unclear manner. - x:
Implementation of ideas, but credit given for effort rather than merit.
y: Irrelevant discussion/effectively blank. - y:
Irrelevant discussion/effectively blank. - z:
Blank.
Grading distribution:
Sections 70854, 70855
Exam code: finalB0xs
p: 37 students
r: 8 students
t: 0 students
v: 1 student
x: 1 student
y: 1 student
z: 0 students
A sample "p" response (from student 3737):
A sample "p" response (from student 4242):
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