A2L Item 193
- Description: Determine the heat extracted during one portion of a thermodynamic cycle.
- Goal: Problem solving in thermodynamics
- Source: UMPERG-ctqpe198
- Keywords: Graphing, Heat, Thermodynamics
The question for students:
An
amount of an ideal gas is taken around the process shown.The amount of
heat extracted during process BC is
- 10 J
- 20 J
- 15 J
- 45 J
- 60 J
- none of the above
- cannot be determined
Commentary for teachers:
Answer
(4) Since no work is done the change in internal energy must be due to heat extraction. Some students may think that the answer cannot be determined because they do not know the number of moles. These are likely thinking that they need to find the temperature at each state to answer the question.