PHYSICS 204
Lecture:
Fall 2018

John Jay College of Criminal Justice,The City University of New York
Prof. Daniel A. Martens Yaverbaum

LAST UPDATED: 12:20 pm, Thurs.,
September 6, 2018


TO SUBMIT WORK, RETRIEVE GRADES & COLLABORATE WITH COLLEAGUES:

https://classroom.google.com/

CLASSROOM CODE: k1hhz7q

Procedures & Policies

 

 DATE

 #

 LECTURE

Pre- READING

 ASSIGNMENT

 FINDING

TuesDAY,

Aug. 28

2018

1

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

the trajectory
of a particle


aka


'a thing on a spring'

(1) prereq = Physics 203
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).

* * *

(2) Begun in class
and completed at home as
Introduction to Harmonic Oscillation,

HW 1:
A Thing On A Spring

THURSDAY,

AUG 30,

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.

No HW due first class.

 

THURSDAY,

AUG 30

2018

2

2. The P204 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

Complete and hand in:

HW1

  A Thing On A Spring

 

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,

SEPTEMBER 4

2018

3

SHO as a Differential Equation:

Identification,
Solution,
Implication

 

HW 2A & 2B:

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).



THURSDAY,

SEPT 6

4

Particles

&
Information
:

UnThingy Things

Continuous Sums:

Superposition & Symmetry,
Shells & Solids

 

HRW:
Chapter 15,
Sections 3 &4

HRW:
Chapter 13,
Section 4


KETCHUP

THURSDAY,
SEPT. 13

 

Action-at-a-distance:

Universal Gravitation

Newton's Shell Theorem

For the curious
& the brave:

a lightning-speed glimpse at the derivation for

Newton's Shell Theorem

HW 3A & 3B:

  A Heat Harmonic,
Hypothesized ;

 

HW 4A

UnThingy Things

THURSDAY,

SEPT. 20

5

Gravitational Oscillator:

(The answer is 42.)

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

HW 5A & 5B:

A Sphere Not Near

HW 6A & 6B

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


TUESDAY,
SEPT. 25

6

The Phase Constant,

The Constantly Increasing Phase,

The Propagation.

 

HW 7A & 7B:

Mathematical Methods

(That we need to know. Without drama.)

 

 

THURSDAY,

SEPT. 27

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

HW 8A & 8B:

Unspringy Springs

HINTS for Unspringy Springs


TUESDAY

SEPT. 25

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.

HW 9A & 9B:

SHOs & Graphs

THURS.,

SEPT. 27

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


HW 10A & 10B:

Multiple Oscillations
&
Wave Pulses

e pluribus unum

TUESDAY,

OCTOBER 2

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

THURSDAY,

OCTOBER 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

 

TUESDAY,

OCTOBER 9

12

Speed of propagation,

relative to the medium:

the Doppler Effect

* * *

 


THURSDAY,

OCTOBER 11

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.

TUESDAY,

OCTOBER 16

14


Gravitational
action-at-a-distance;

a letter to Sir Bentley;

the electrostatic
force

THURSDAY,

OCTOBER 18

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


16

Regions,
Boundaries;

Open,
Closed.

THURSDAY,

OCTOBER 25

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.)

 

 

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.

THURSDAY,

NOVEMBER 1

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

TUESDAY,
NOVEMBER 6

&

THURSDAY,
NOVEMBER 8

20


Continuous charge
distributions
&
electrostatic
FLUX

Gauss's Law:
MOTIVATED


Coulomb's Law Textbook Solutions


EXAM 2 TAKE-HOME
SECTION:

Doppler Plus
(Due Wednesday)

TUESDAY,
NOVEMBER 13

&

THURSDAY,
NOVEMBER 15


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.

TUESDAY,
NOVEMBER 20

&

TUESDAY,
NOVEMBER 27

22


Electrostatic Potential,
Capacitance
& Current

Magnitude of the magnetic field:

1. Oersted's finding,

2. The Biot-Savart law

THURSDAY,
NOVEMBER 29

&

TUESDAY,
DECEMBER 4


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!)

THURSDAY,

DECEMBER 6

24


The Official Practice Final

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

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

TUESDAY,

DECEMBER 11

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

 

THURSDAY,

DECEMBER 13

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.)

THURSDAY, DECEMBER 20,

 

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!

10:30 am - 12:30 pm


Extra Credit Assignment
(optional)

           
           
           
                                                                                                                                                                                                                                   

 

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