PHY 113 C Fall 2013 Lecture 25 1 PHY 113 C General Physics I 11 AM 1215 P M MWF Olin 101 Plan for Lecture 25 Comments on Exam 3 Pep talk on preparing for Final Exam Comprehensive review Part I ID: 619550
Download Presentation The PPT/PDF document "12/93/2013" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
1
PHY 113 C General Physics I
11 AM – 12:15
P
M MWF Olin 101
Plan for Lecture 25:
Comments on Exam 3
Pep talk on preparing for Final Exam
Comprehensive review – Part I
Bonus attendance points for Lecture 26
– Part II of comprehensive review & course assessmentSlide2
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
2Slide3
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
3
Final exam schedule for PHY 113 CSlide4
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
4
Comments on Final Exam
It will be comprehensive (covering material from Chapters 1-22)
It is scheduled for 9 AM Dec. 12
th
in Olin 101
In class format, but there will be no time pressure
May bring equation sheets according to your voteSlide5
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
5
Comments on Exam 3
iclicker
question
Which of the following statements matches your recollections of the exam:
It was too hard
It was too easy
The Thanksgiving holiday erased all recollections of the exam
Solutions are now posted:
http://users.wfu.edu/natalie/f13phy113/solutions/Slide6
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
6
Two versions of take-home portion of examSlide7
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
7
Take home portion of Exam 3 -- continuedSlide8
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
8
Take home portion of Exam 3 -- continuedSlide9
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
9
Take home portion of Exam 3 – continued
Two problems with question:
Round-off error in adiabatic step
Error in Lecture 21 notes (now corrected)Slide10
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
10
Work done
on
a
system which is an ideal gas:
“Adiabatic” (no heat flow in the process process)
P (1.013 x 10
5
) Pa
P
i
V
i
V
f
Q
i
®
f
= 0
For ideal gas:
PV
g
= P
i
V
i
g
Corrected equations from #21:Slide11
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
11
Further comments on adiabatic processesSlide12
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
12
Take home portion of Exam 3 -- continuedSlide13
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
13
iclicker
question
This problem
Of all the problems that might appear on the final exam, this one would be
the worst.
Of all the problems that might appear on the final exam, this one would
not
be
the worst
.
This example has inspired me to look into designing
better
engines
or heat
pumps.Slide14
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
14
In-class portion of Exam 3 Slide15
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
15
In-class portion of Exam 3 -- continued
toward
awaySlide16
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
16
In-class portion of Exam 3 -- continued
V
S
f’=560 Hz
V
S
f’=480 HzSlide17
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
17
V
S
f’=560 Hz
V
S
f’=480 HzSlide18
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
18
In-class portion of Exam 3 -- continuedSlide19
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
19
In-class portion of Exam 3 -- continued
F
B
mgSlide20
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
20
In-class portion of Exam 3 -- continued
iclicker
question
This density seems correct.
This density seems wrong.Slide21
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
21
In-class portion of Exam 3 -- continuedSlide22
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
22
In-class portion of Exam 3 -- continuedSlide23
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
23
Back to the discussion of the Final exam:
iclicker
question
What is the purpose of the Final Exam?
Pure pain and suffering
Assessment of student learning
Gateway to medical school or other professional career
Help students to “solidify” knowledge of physics and further develop problem solving skills
All of the theseSlide24
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
24
iclicker
question
How many equation sheets should you prepare for Final Exam?
0
1
2
3
4Slide25
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
25
General advice on how to prepare for Final Exam
Review fundamental concepts and their corresponding equations
Develop equation sheet(s) that helps you solve example problems on all of the material. You can assume that empirical constants and parameters will be given to you; they need not take up space on your equation sheet.
Practice problem solving techniques.
If you discover unanswered questions, please contact me.Slide26
12/93/2013
Advice:
Keep basic concepts and equations at the top of your head.
Practice problem solving and math skills
Develop an equation sheet that you can consult.
Equation Sheet
Problem solving skills
Math skills
26
PHY 113 C Fall 2013 -- Lecture 25Slide27
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
27
Problem solving steps
Visualize problem – labeling variables
Determine which basic physical principle(s) apply
Write down the appropriate equations using the variables defined in step 1.
Check whether you have the correct amount of information to solve the problem (same number of knowns and unknowns).
Solve the equations.
Check whether your answer makes sense (units, order of magnitude, etc.).Slide28
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
28
Specific review material -- standing sound waves
General wave equation:
wave propagation distance
time
wave speedSlide29
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
29
Specific review material -- standing sound waves
Periodic wave:
Periodic traveling waves:
Amplitude
wave length (m)
period (s);
T = 1/f
phase (radians)
velocity (m/s)Slide30
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
30
“Standing” wave:
Combinations of waves (“superposition”)Slide31
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
31
Specific review material -- standing sound waves
open-open
open-closed
y(
x,t
) is density fluctuations in the air
v=
v
sound
»
343 m/sSlide32
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
32
Specific review material -- standing string waves (which can couple to sound)
LSlide33
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
33
iclicker
question
How can we hear a standing wave on a string?
The string couples to the air to produce a sound wave at the same wavelength
The string couples to the air to produce a sound wave at the same
frequency
You cannot hear a standing wave on a stringSlide34
12/93/2013
PHY 113 C Fall 2013 -- Lecture 25
34
Bonus attendance points for Lecture 26
– Part II of comprehensive review & course
assessment
Bonus points for emailing in questions you would like to discuss in Lecture 26