Cuesta College, San Luis Obispo, CA
Cf. Giambattista/Richardson/Richardson, Physics, 1/e, Comprehensive Problem 6.85
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Solution and grading rubric:
- p:
Correct. Identifies relevant terms in energy balance equation (Ktr, Ugrav, Uelas), and solves for xi. - r:
Nearly correct, but includes minor math errors. - t:
Nearly correct, but approach has conceptual errors, and/or major/compounded math errors. - v:
Implementation of right ideas, but in an inconsistent, incomplete, or unorganized manner. At least some attempt at energy conservation, but with missing or misapplied energy terms. - x:
Implementation of ideas, but credit given for effort rather than merit. - y:
Irrelevant discussion/effectively blank. - z:
Blank.
Grading distribution:
p: 12 students
r: 7 students
t: 4 students
v: 8 students
x: 1 students
y: 1 student
z: 1 student
A sample of a "p" response (from student 2325), setting up a "zero-sum" energy balance equation:
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