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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

lecture 2013 113 phy 2013 lecture phy 113 fall exam portion wave continued class final problem review equation sound

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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

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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

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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

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PHY 113 C Fall 2013 -- Lecture 25

6

Two versions of take-home portion of examSlide7

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PHY 113 C Fall 2013 -- Lecture 25

7

Take home portion of Exam 3 -- continuedSlide8

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PHY 113 C Fall 2013 -- Lecture 25

8

Take home portion of Exam 3 -- continuedSlide9

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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

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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

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PHY 113 C Fall 2013 -- Lecture 25

11

Further comments on adiabatic processesSlide12

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PHY 113 C Fall 2013 -- Lecture 25

12

Take home portion of Exam 3 -- continuedSlide13

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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

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PHY 113 C Fall 2013 -- Lecture 25

14

In-class portion of Exam 3 Slide15

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PHY 113 C Fall 2013 -- Lecture 25

15

In-class portion of Exam 3 -- continued

toward

awaySlide16

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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

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PHY 113 C Fall 2013 -- Lecture 25

17

V

S

f’=560 Hz

V

S

f’=480 HzSlide18

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18

In-class portion of Exam 3 -- continuedSlide19

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PHY 113 C Fall 2013 -- Lecture 25

19

In-class portion of Exam 3 -- continued

F

B

mgSlide20

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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

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PHY 113 C Fall 2013 -- Lecture 25

21

In-class portion of Exam 3 -- continuedSlide22

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PHY 113 C Fall 2013 -- Lecture 25

22

In-class portion of Exam 3 -- continuedSlide23

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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

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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

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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

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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

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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

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PHY 113 C Fall 2013 -- Lecture 25

28

Specific review material -- standing sound waves

General wave equation:

wave propagation distance

time

wave speedSlide29

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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

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PHY 113 C Fall 2013 -- Lecture 25

30

“Standing” wave:

Combinations of waves (“superposition”)Slide31

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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

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PHY 113 C Fall 2013 -- Lecture 25

32

Specific review material -- standing string waves (which can couple to sound)

LSlide33

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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

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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