Physics quiz archive: rotations, torque, pressure, buoyancy, fluid flow

Physics 205A Quiz 5, fall semester 2019
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz05Gu1L



Sections 70854, 70855 results

0- 6 :	** [low = 6]
7-12 :	*********
13-18 :	***********
19-24 :	***************** [mean = 19.8 +/- 6.3]
25-30 :	************* [high = 27]

Physics quiz archive: rotations, torque, pressure, buoyancy, fluid flow

Physics 205A Quiz 5, fall semester 2018
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz05Ro74



Sections 70854, 70855 results

0- 6 :
7-12 :	******** [low = 9]
13-18 :	**************
19-24 :	************************* [mean = 19.6 +/- 5.2]
25-30 :	***** [high = 30]

Physics quiz archive: rotations, torque, pressure, buoyancy, fluid flow

Physics 205A Quiz 5, fall semester 2017
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz05nWaW



Sections 70854, 70855 results

0- 6 :
7-12 :	***** [low = 9]
13-18 :	***************
19-24 :	********************* [mean = 19.7 +/- 4.8]
25-30 :	***** [high = 27]

Physics quiz archive: rotations, torque, pressure, buoyancy, fluid flow

Physics 205A Quiz 5, fall semester 2016
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz05b0oM



Sections 70854, 70855, 73320 results

0- 6 :	*** [low = 6]
7-12 :	***********
13-18 :	************************* [mean = 16.6 +/- 6.0]
19-24 :	************
25-30 :	* [high = 30]

Physics quiz archive: rotations, torque, pressure, buoyancy, fluid flow

Physics 205A Quiz 5, fall semester 2015
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz05bL8D



Sections 70854, 70855, 73320 results

0- 6 :	** [low = 0]
7-12 :	****************
13-18 :	************************** [mean = 17.2 +/- 6.1]
19-24 :	**************
25-30 :	******** [high = 30]

Physics quiz archive: rotations, torque, pressure, buoyancy, fluid flow

Physics 205A Quiz 5, fall semester 2014
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz05mRp4



Sections 70854, 70855, 73320 results

0- 6 :	*** [low = 6]
7-12 :	*****************
13-18 :	************************* [mean = 16.5 +/- 5.7]
19-24 :	**************
25-30 :	***** [high = 30]

Physics quiz archive: rotations, torque, pressure, buoyancy, fluid flow

Physics 205A Quiz 5, fall semester 2013
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, 73320, version 1
Exam code: quiz05LuF7



Sections 70854, 70855, 73320 results

0- 6 :
7-12 :	************ [low = 12]
13-18 :	*********************** [mean = 18.4 +/- 4.9]
19-24 :	**********************
25-30 :	**** [high = 30]

Physics quiz archive: rotations, torque, pressure, buoyancy, fluid flow

Physics 205A Quiz 5, fall semester 2012
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1
Exam code: quiz05L4mN



Sections 70854, 70855 results

0- 6 :	***** [low = 6]
7-12 :	*************
13-18 :	****************** [mean = 16.0 +/- 5.7]
19-24 :	***************
25-30 :	* [high = 30]

Physics quiz archive: rotations, torque, pressure, fluid flow

Physics 205A Quiz 5, fall semester 2011
Cuesta College, San Luis Obispo, CA
Sections 70854, 70855, version 1


Sections 70854, 70855 results
Exam code: quiz05t0rQ

0- 6 : *  [low = 6]
 7-12 : ***************
13-18 : **********************  [mean = 16.8 +/- 5.2]
19-24 : *********
25-30 : ****  [high = 30]

Found physics: accelerating carbonation bubbles

20090621165
http://www.flickr.com/photos/waiferx/3656904227/
Originally uploaded by Waifer X

Rising carbonation bubbles in Wider's pear cider, Black Sheep Bar & Grill, San Luis Obispo, CA. Assuming that bubbles are forming and being released at regular time intervals at nucleation sites, increasing space between bubbles indicates acceleration (due to the buoyant force and Newtonian fluid forces, etc.). Photo by Cuesta College Physical Sciences Division instructor Dr. Patrick M. Len.

Physics clicker question: lava lamps

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

Cf. Giambattista/Richardson/Richardson, Physics, 1/e, Conceptual Question 14.8

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

[0.6 participation points.] Why do wax droplets rise in a lava lamp after being heated in the base?
(A) Heat rises.
(B) Weight decreases.
(C) Density decreases.
(D) (I'm lost, and don't know how to answer this.)

Sections 4987, 4988
(A) : 9 students
(B) : 0 students
(C) : 21 students
(D) : 1 student

Correct answer: (C)

A lava lamp is an excellent demonstration of the principles of thermal convection. The light bulb at the bottom of the lava lamp heats the wax, which causes it to expand, decreasing in density. The expanded wax then rises, as it is now less dense than the fluid it is suspended in. Later after cooling at the top of the fluid, the wax will decrease in volume, increasing in density, and later sink.


"How lava lamps work"
http://home.howstuffworks.com/lava-lamp.htm
http://video.google.com/videoplay?docid=1145452462666090515

Physics clicker question: buoyancy comparison

Physics 5A, Fall Semester 2007
Cuesta College, San Luis Obispo, CA

Cf. Giambattista/Richardson/Richardson, Physics, 1/e, Conceptual Question 9.6 (extended)

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

Three objects (same volumes, but different densities) float (or do not float) in a tank of water.

[0.6 participation points.] Which object has the greatest weight?
(A) Object X.
(B) Object Y.
(C) Object Z.
(D) (More than one of the objects listed above has the greatest weight.)
(E) (I'm lost, and don't know how to answer this.)

Sections 0906, 0907
(A) : 1 student
(B) : 0 students
(C) : 29 students
(D) : 2 students
(E) : 0 students

Correct answer: (C)

Most students appealed to their intuition to determine that Object Z was the heaviest. Weight force vectors are now drawn on the diagram, and the next question is asked.

[0.6 participation points.] Which object has the greatest bouyant force exerted on it?
(A) Object X.
(B) Object Y.
(C) Object Z.
(D) (More than one of the objects listed above has the greatest bouyant force exerted on it.)
(E) (I'm lost, and don't know how to answer this.)

Sections 0906, 0907
(A) : 22 students
(B) : 3 students
(C) : 2 students
(D) : 7 students
(E) : 0 students

Correct answer: (D)

The magnitude of the bouyant force is the weight of the volume of water displaced. Object X displaces only a portion of its volume, and thus has the least amount of bouyant force exerted on it. Both Objects Y and Z are completely submerged, and thus have the same amount of bouyant force exerted on it. (However, Object Z also has a normal force exerted on it, from the bottom of the tank.)