* * * E & M * * *
(a Saint Ann's Study of)
* * * I & P. * * *

2018 - 2019

Daniel A. Martens Yaverbaum

Note:
LAST UPDATED 1:50 am, October 16, 2018

Please continue to 'black-out' 2:45 PM TO 5:50 PM EVERY TUESDAY (F2018 - S2019).
but NOTE:
5:25 PM - 5:49 PM IS LECTURE-GRACE-PERIOD/HALF-OFFICE-HOUR.
BY 3:00 PM, WE ARE FULLY IN MOTION !
To : Use https://classroom.google.com/u/0/h, CLASSROOM CODE: r68ffkn

 DATE

 #

 LECTURE

Pre- READING

 ASSIGNMENT

 FINDING

Tuesday,

SEPTEMBER 11

2018

1

Case Study 1
from
Classical Mechanics
(' Physics 203'):

the trajectory
of a particle


aka


'a thing on a spring'

(1) prereq = Physics 1

or some roughly equivalent
calculus-based study in Classical Mechanics. Refresh yourself with this fundamental material. Make sure you are particularly ready to go with :

The Conservation of Energy &
Conservative Forces, esp.:

Universal Gravitation (Newton)
&
 Elasticity (Hooke)

* * *
(2) text = Halliday,
Resnick & Walker,

Fundamentals of Physics

(henceforth, HRW).

UnThingy Things

TUESDAY,

SEPT. 18

2018

2

1. The P204 way to
consider ENERGY
(when conserved):

A characteristic
(combination of measurements)

that holds constant
from PLACE to PLACE
while a system
continues to
exhibit signficant,
yet symmetric,
changes over time.

HW 1:

0.UnThingy Things

1. A Thing On A Spring

 

2. WHO ARE YOU?

 

TUESDAY,

SEPT. 25

2018

2

2. The I&P way to
transfer WORK
(when assigned):

Google Classroom.

A characteristic of our method
by virtue of which
we continue to track
the presence of progress
even in
the absence of perfection:

Solve Once,
Submit Twice.


In HRW, Read:

Chapter 15,
sections 1 & 2 ;

Chapter 13,
sections 1-3


HW 3A & 3B:

  A Heat Harmonic,
Hypothesized;

 

HW 4A & 4B:

HRW,  Chapter 15,
Problems (not 'Questions')

#9*, 29, 31

*PLUS this variation on Problem 9:
Assume the mass of this oscillator is 30 kg.  If an ideal spring is causing the simple harmonic oscillation, find the spring constant (K).

Our two paths from
Physics 203
to Physics 204, i.e.:

from
'characters
that go'
to
'characteristics
that flow':


OSCILLATION
(simple harmonic, chapter 15)

&

INTERACTION
(at-a-distance, chapter 13)

 

TUESDAY,

OCTOBER 2,
2018

3

SHO as a Differential Equation:

Identification,
Solution,
Implication

 


KETCHUP!

 

(SEE ROW(s) ABOVE)


TUESDAY,

OCTOBER 9,

2018

4

Continuous Sums:

Superposition & Symmetry,
Shells & Solids

 

HRW:
Chapter 15,
Sections 3 &4

HRW:
Chapter 13,
Section 4


 

HW 5A & 5B:

A Sphere Not Near

HW 6A & 6B:

HRW Chapter 13,
Problems
(not 'Questions')
#3, 19, 24, 31

TUESDAY,

OCTOBER 16,

2018

 

Action-at-a-distance:

Universal Gravitation

Newton's Shell Theorem

For the bold & the brave,
for the young & the restless,

and for a caffeine-free
rush ride through the infinitesimal
thought thicket ,
Behold:
A topsy-turbo glimpse at

HW 5A & 5B:

A Sphere Not Near

 

HW 6A & 6B:

HRW Chapter 13,
Problems
(not 'Questions')
#3, 19, 24, 31

TUESDAY,

OCTOBER 23,

2018

5

Gravitational Oscillator:

(The answer is 42.)

A little primer on
The Phase Constant
&
the Whole "Angular" Thing

HW 7A & 7B:

Mathematical Methods

(That we need to know. Without drama.)

 

HW 8A & 8B:

Unspringy Springs

HINTS for Unspringy Springs

OCTOBER

30

6

The Phase Constant,

The Constantly Increasing Phase,

The Propagation,

The Multiple Oscillations

&

The Wave Pulse

 

HW 9A & 9B:

SHOs & Graphs

HW 10A & 10B:

e pluribus unum

NOVEMBER

6

7

DERIVING
The Wave Equation

Version 1:
A Row of SHOs

HRW:
Chapter 16 (Waves-I),
Sections 1-4


* * *

Supplemental Video
(a super-fast glimpse
at past class data) :

1. Wu Lab
2. WaltersJ Lab

 


NOVEMBER

13

8


DERIVING
The Wave Equation

Version 2:
Induction From Lab Data
(The motion at points in space,
The shape at points in time.)

(The Complete)
Official Practice Midterm 1

(Note: I added another question to Part 1.
It is question e.)

Updated & Finalized
Solutions to Part 1 &
Solutions to Part 2

READ THIS
Do not skip this note.

 

NOVEMBER

20

9


DERIVING
The Wave Equation

Version 3:
Tension, Mass, and Slope
on an Pulsating String.

INDUCING
the Wave Equation from data

Some Midterm Practice Problems


NOVEMBER 27

10


Approximations & Matters of Taste:

Where the pure beauty of math meets the messy beauty of the real world.


Midterm Practice Materials:

(The three links below are all for extra practice. They will not be collected)

Some more SHO Practice Problems

A Past Midterm
Please SKIP problem D (pg. 8) in the link above. Doppler will not be on Midterm 1 this semester.

Another weird little video,
not for the faint of heart:
Interference of WavePulses

DECEMBER 4

11

MIDTERM #1:

OSCILLATION & PROPAGATION

FIRST:
Watch all of this video

THEN:
Watch the first 1m & 8s of this video

The videos above are from Khan Academy.
We will NOT use Khan's method for deriving Doppler equations, but the conceptual introduction (first video) & the animation (second video) are very helpful.

THEN read:
HRW, Chapter 17 (Waves-II):
17-1 (Speed of Sound),
17-7 (The Doppler Effect)
17-8 (Supersonic Speeds)

HW 11A & 11B:

Doppler

 

DECEMBER 11

12

Speed of propagation,

relative to the medium:

the Doppler Effect

* * *

 


DECEMBER 18

13

Interference
&
Standing Waves,

Power
&
Intensity

READ in HRW:
16-5 (Interference of Waves),
16-7 (Standing Waves)
17-3 (Interference)
17-4 (Intensity & Sound Level)


Then WATCH:
This Wave-Interference Simulation
This simulation will be explained in the Wave Simulation Homework to the right.

Another Interference Simulator

Another Doppler Simulator

HW 12:

Resonance & Volume
Skip part II, question B
and part III, questions A & B.
They will be due on Wednesday.

JANUARY 8

14


Gravitational
action-at-a-distance;

a letter to Sir Bentley;

the electrostatic
force

JANUARY 15

15

Two ways to
Multiply Vectors

The e,
the e-Charge,
& the e-Force

READ in HRW:
Chapter 21 (Coulomb's Law)

(Don't stress about section 22-3;
all you really need to know is the title: charge is conserved.)

Chapter 22 (Electric Fields)
You do NOT need to read these 2 sections:
22-5 (E. Field Due to Charged Disk),
22-7 (Dipole in E-Field)
In 22-6, the improtant part is the opening two paragaphs. All that stuff about "Measuring the Elementary Charge" and "Inkjet Printing" is cool, but not required reading

That's a bunch of reading.
Leave time for it.


HW 13:

Interference & Power
This is an expansion and elaboration of the questions we skipped from HW 10.


HW 14:

E-Forces → E-Fields

JANUARY 22

16

Regions,
Boundaries;

Open,
Closed.

JANUARY 29

17

Midterm Prep

READ HRW:
Chapter 3, section 3
(Multiplying Vectors)


MIDTERM TOPICS:

  • Doppler (practice all four cases)
  • 1-D wave interference & harmonics
  • Acoustic* intensity, power, & energy
  • Electrostatic Force on point-charges
  • Dot products & cross products

(NOTE: "acoustic" means "sound" as an adjective.)


HW 12:

Mathematical Mthods II:
Vector Multiplication


HW 13 (optional):

Coulomb's Law:
HRW Chapter 21:
QUESTIONS #9 & #10;
&
PROBLEMS #3 & #13

Problem 13 is a CHALLENGE PRBOLEM.
Here's a HINT:
the y coordinate will have to be zero.
The reason is that, if the two forces cancel, they must be exactly opposite, i.e. colinear. This is only possible if the three point-charges are all in a row.

(HW 13 was posted late, so it's optional, but it will be useful for exam prep & you can get points for it if you hand it in.)

 

FEBRUARY 5

18

From objects
to information:

the electrostatic
field

The Vector Field Diagram
&
The Field Line
Diagram

Doppler Solutions

Resonance & Volume I Solutions

Resonance & Volume II Solutions

A nice explanation of
Interference & Nodes in Two Dimensions
from the INTERNET.

FEBRUARY 19

&

FEBRUARY 26

19

MIDTERM #2:

INTERFERENCE, INTENSITY, & ELECTROSTATICS

WATCH:
This Electric Field Simulator

Then READ HRW:
Chapters 23 - Guass's Law
(whole chapter)

Another lightning-speed mathomusic video:
unpacking Gauss's Law

HW 14:

The E-Field from a point:
HRW Chapter 22,
Problems #3, 9, 19.


HW 15:

Field Diagrams

MARCH 5

&

MARCH 12

20


Continuous charge
distributions
&
electrostatic
FLUX

Gauss's Law:
MOTIVATED


Coulomb's Law Textbook Solutions


EXAM 2 TAKE-HOME
SECTION:

Doppler Plus
(Due Wednesday)

MARCH 19

&

MARCH 26

21


Gauss's Law:
APPLIED

The Gaussian Sphere

The Gaussian Cylinder

READ in HRW:
Chapters 24 & 25
You can skim/skip some parts of these chapters.
Here are the important sections:
24-1 (Electric Potential),
24-2 (Equipotential Surfaces & etc.)
24-6 (Calculating Field from Potential)
24-8 (Potential of Charged, Isolated Conductor)
25-1 (Capacitance)


EXAM 2 TAKE-HOME
SECTION:

Doppler Plus
(Due)

No homework due besides the exam.

APRIL 2

&

APRIL 9

22


Electrostatic Potential,
Capacitance
& Current

Magnitude of the magnetic field:

1. Oersted's finding,

2. The Biot-Savart law

APRIL 23

23

Direction of the magnetic field:

1. cross products, r - hat
&
2. the noBflux rule

Magnetic Flux

HRW:
Chapters 28 & 29.
Read on the following sections:

28-1 (Magnetic Fields and the definiton of B)
28-6 (Mag Force on Current-Carrying Wire)
29-1 (Magnetic Field due to Current)
29-2 (Force Between Parallel Currents)
29-3 (Ampere's Law)


HW 16:

Gauss Updated
(Even more updated!)

APRIL 30

&

MAY 7

24


The Official Practice Final

(Part 4 updated, 7:05 pm, Tuesday.)

Practice Exam Soultions:
Parts 1 & 2
Parts 3 & "4"

MAY 14

&

MAY 21

25

A capacitor in a condom,

a right side corrected,

a field out of space. . .

HRW:
Chapters 27, 30 & 32.
Read on the following sections:

27-4 (RC Circuits)
30-1 (Faraday & Lenz)
30-3 (Induced Electric Fields)
32-1 (Gauss's Law for Magnetic Fields)
32-2 (Induced Magentic Fields)
32-3 (Displacement Current)

These homeworks are here if you want a little extra practice. They are NOT going to be collected.

HW 17:

Steady Circuits:
Ohm's Law


HW 18:

Capacitance

 

MAY 28

26


Maxwell's Displacement Current
&
Einstein's Second Postulate

2D Electric Field Simulator

3D Electric Field Line Simulator
(Use the drop-down menus on the left to switch the display from "particles" to "field lines" and to try different charge configurations.)

JUNE 4

 

F
I
N
A
L

An OLD Exam
for extra practice:

P204 FINAL
EXAM, Fall '17

Another OLD Exam for more extra practice:

P204 FINAL EXAM, Summer '14

Yet another old exam
for even more extra practice:

ALL 52 PAGES of

P204 FINAL EXAM,
Summer '15

FULLY SOLVED!

Return TextBook;
then meet at PARK PLAZA DINER, 3:00 pm - 5:30 pm



           
           
           
                                                                                                                                                                                                                                   

 

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