Physics quiz archive: temperature, thermal equilibrium, heat transfers

Physics 205A Quiz 7, fall semester 2019
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855
Exam code: quiz07VlnC



Sections 70854, 70855 results

0- 6 :	* [low = 3]
7-12 :	**********
13-18 :	**************
19-24 :	******************* [mean = 18.9 +/- 6.2]
25-30 :	******* [high = 30]

Physics quiz archive: temperature, thermal equilibrium, heat transfers

Physics 205A Quiz 7, fall semester 2018
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz07PeA7



Sections 70854, 70855 results

0- 6 :	** [low = 6]
7-12 :	****
13-18 :	***********
19-24 :	********************** [mean = 20.8 +/- 6.0]
25-30 :	************ [high = 30]

Physics quiz archive: temperature, thermal equilibrium, heat transfers

Physics 205A Quiz 7, fall semester 2017
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz07Whu7


Sections 70854, 70855 results

0- 6 :
7-12 :	******* [low = 9]
13-18 :	*************
19-24 :	******************* [mean = 18.9 +/- 5.4]
25-30 :	*** [high = 27]

Physics quiz archive: temperature, thermal equilibrium, heat transfer

Physics 205A Quiz 7, fall semester 2016
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz07p4sT



Sections 70854, 70855, 73320 results

0- 6 :	* [low = 6]
7-12 :	*************
13-18 :	***************
19-24 :	*************** [mean = 18.5 +/- 6.6]
25-30 :	******** [high = 30]

Physics quiz archive: temperature, thermal equilibrium, heat transfer

Physics 205A Quiz 7, fall semester 2015
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz07zSOL



Sections 70854, 70855, 73320 results

0- 6 :	* [low = 3]
7-12 :	*****
13-18 :	*****************
19-24 :	****************************** [mean = 21.2 +/- 5.6]
25-30 :	**************** [high = 30]

Physics quiz archive: temperature, thermal equilibrium, heat transfer

Physics 205A Quiz 7, fall semester 2014
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz07cO4t



Sections 70854, 70855, 73320 results

0- 6 :
7-12 :	**** [low = 9]
13-18 :	*******
19-24 :	******************** [mean = 24.2 +/- 5.5]
25-30 :	********************** [high = 30]

Physics quiz archive: temperature, thermal equilibrium, heat transfer

Physics 205A Quiz 7, fall semester 2013
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz07b0o7



Sections 70854, 70855, 73320 results

0- 6 :	** [low = 6]
7-12 :	****
13-18 :	****************************** [mean = 18.5 +/- 4.8]
19-24 :	********************
25-30 :	*** [high = 30]

Physics quiz archive: temperature, thermal equilibrium, heat transfer

Physics 205A Quiz 7, fall semester 2012
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz07Di5k



Sections 70854, 70855 results

0- 6 :	***** [low = 3]
7-12 :	************
13-18 :	********************** [mean = 15.2 +/- 5.4]
19-24 :	*********** [high = 24]
25-30 :

Physics quiz archive: temperature, thermal equilibrium, heat transfer

Physics 205A Quiz 7, fall semester 2011
Cuesta College, San Luis Obispo, CA

Sections 70854, 70855, version 1
Exam code: quiz07n0N3
Sections 70854, 70855 results
Quiz 7 results (max score = 30):

0- 6 :	* [low = 6]
7-12 :	********
13-18 :	*******************
19-24 :	*************** [mean = 19.2 +/- 5.7]
25-30 :	********* [high = 30]

Physics clicker question: latent heat

Physics 5A, Spring Semester 2008
Cuesta College, San Luis Obispo, CA

Cf. Giambattista/Richardson/Richardson, Physics, 1/e, Multiple-Choice Question 14.4

Students were asked the following clicker question (Classroom Performance System, einstruction.com) near the start of their learning cycle:

[0.6 participation points.] The heat capacity of a material undergoing a phase change (such as melting/freezing, or boiling/condensing) is typically:
(A) 0.
(B) ∞.
(C) some finite number.
(D) (Not enough information is given.)
(E) (I'm lost, and don't know how to answer this.)

Sections 4987, 4988
(A) : 8 students
(B) : 7 students
(C) : 12 students
(D) : 1 student
(E) : 0 students

Correct answer: (B)

The heat capacity is given by:

C = Q/delta(T).

When heat is put into (or taken from) a system undergoing a phase change, the temperature remains constant, and thus the denominator is zero, making the heat capacity infinite. Thus a system undergoing a phase change cannot have a defined heat capacity, as the heat goes into breaking or making bonds, instead of increasing/decreasing the amount of thermal energy in the system. Instead, the latent heat is defined:

L = Q/m,

where m is the amount of material undergoing a phase change.