PHYSICS 204
Lecture: Fall 2018

John Jay College of Criminal Justice,
The City University of New York

Prof. Daniel A. Martens Yaverbaum

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 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

 

Depending
on the
Dependent Variable:

 

Facing the Feedback

in a
Differential Equation

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

The Homogeneity of all Time;

The Long & SHOrt of all Clocks:

 

the
Amplitude-
Independent Period

 

 

TUESDAY,
SEPT. 25

6

Refresh & Recollect:

The Fundamental Interaction of

Universal Gravitation:

ACTION-AT-A-DISTANCE.

HW 5A & 5B:

A Sphere Not Near

THURSDAY,

SEPT. 27

7

Reconsider

The problem-solving implications of

SUPERPOSITION
(of forces)

&

SYMMETRY
(of space):

 

Newton's Shell Theorem

 


HW 6A & 6B:

 

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


TUESDAY

OCTOBER 2

8

Making sure of the mathematics:

(1) we'll stretch
our legs
and put the
Dif. Eq. for SHO through its paces;


(2) then we'll
shake some hands
and be pleased to meet a new vector technique:

(the unit vector notation for vector
multiplication)

Below,
a bit of
required reading.

Please note.
The reading is not necessarily easy
nor fun,
but it has
actually been reported,
by some students,
to be somewhat helpful
and clarifying:

The Phase
Constant:

and/or

What Has
Phi Done
For You Lately?

HW 7A & 7B:

Mathematical Methods

(That we need to know. Without drama.)

 

 

HW 8A & 8B:

Unspringy Springs

HINTS for Unspringy Springs

THURS.,

OCT. 4

9

1) A Gravitational Oscillator

(The answer is 42).

 

2) An increase
in the
phase constant -->


a constant
in the
increasing phase -->

a propagation:

deriving the wave equation,

version 1:
a row of sho's.

* * *

 

A
PRACTICE EXAM
for
MidTERM 1:pdf

MT1_SU17

. . .with
Full
Solutions . . . !

HW 9A & 9B:

SHOs & Graph




HW 10A & 10B:

Multiple Oscillations
&
Wave Pulses

e pluribus unum

TUESDAY,

OCTOBER 9

10

DERIVING
The Wave Equation

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

* * *

DERIVING
The Wave Equation

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

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


* * *

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


1. Wu Lab
2. WaltersJ Lab

INDUCING

the
Wave Equation
from data

THURSDAY,

OCTOBER 11

11

MIDTERM #1:

OSCILLATION & PROPAGATION

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 16

12

Speed of propagation,

relative to the medium:

the Doppler Effect

* * *

Some Practice for MidTerm 1

(The first two links below
are for extra exam practice.
They are highly recommended, and
will not be collected
nor graded in any manner)

(1) Some more SHO
Practice Problems

(2) A Past Midterm

The last link, below,
offers yet another
unwarranted
video vignette:
entirely optional,
fit only for
further perspective,
and forbidden from folks feeling fairly fragile or fundamentally faint of heart.


(3) Interference of WavePulses

 


THURSDAY,

OCTOBER 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.

TUESDAY,

OCTOBER 23

14


Gravitational
action-at-a-distance;

a letter to Sir Bentley;

the electrostatic
force

THURSDAY,

OCTOBER 25

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

TUESDAY,
OCT. 30

16

Regions,
Boundaries;

Open,
Closed.

THURSDAY,

NOVEMBER 1

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.)

 

TUESDAY,

NOVEMBER 6

&

THURSDAY,

NOVEMBER 8

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.

TUESDAY,

NOVEMBER 13

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

THURSDAY,

NOVEMBER 15

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 20

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,

NOV. 27

 

22


Electrostatic Potential,
Capacitance
& Current

Magnitude of the magnetic field:

1. Oersted's finding,

2. The Biot-Savart law

THURSDAY,

NOV. 29


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!)

TUESDAY,

DEC. 4

24


The Official Practice Final

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

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

 

THURSDAY,

DECEMBER 6

 

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

 

 

TUESDAY,

DECEMBER 11.

NOTE: Wed., Dec. 12 =

Last Day of Classes.

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)

           
           
   

 

 

(The Complete)
Official Practice Midterm 1

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

READ THIS
Do not skip this note.

- Prof. Bean, SU18


                                                                                                                                                                                                                                   

 

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