Physics7A Lecture A Quiz 1
Problem 1 Rubric
Part (a) 30%
Q (10): Correct answer (see solution).
W (9.5): Small arithmetic error. The two most common examples were reading the labels on the graph
incorrectly, and making an error while subtracting. Students that got a W demonstrated that they knew
how to do the problem, and made no mistakes besides an arithmetic error.
E (7.7): Conceptual error in finding
∆
E
A
. The most common example was to confuse the values of E on
the xaxis with the change in energy during a process. A student might think that
∆
E
A
= 250 J instead
of 1500J because that is the value of E
A
at the intermediate point. The differences between start and
finish are what matter, not the actual values.
R (7): Shows understanding that heat must flow from B to A, but does not find a numerical estimate for
any
∆
E's or temperatures.
T (5): There is some attempt to answer the question; however, there are serious conceptual flaws and it
is not clear that the student understands the physics of the problem.
Y (0): Blank or effectively blank.
Part (b) 30%
Q (10): Correct answer (see solution).
W (8.5): Answers correctly that A will not boil. However, the justification is missing, incorrect, or is
just based on intuition. One example is that the student assumes that thermal equilibrium means that A
and B will reach the same energy instead of the same temperature. Another example is a statement that
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 Winter '08
 PARDINI
 Physics, Thermodynamics, energy system, conceptual flaws, Small arithmetic error

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