# Wright State University Lake Campus/2018-9/Phy1050/Notes

Quizbank/HTW/All♠/Slide whistles and harmonyPage bottom

Quiz: C0 22-23

### Thu 30 August 2018 (UTC)

Review simple arithmetic: In class project to explain how to do them

Writing project on the area under a velocity V time graph
Goal group lab: Explain the relationship between area and distance on a v(t) graph.

Define average velocity as distance over time
Instantaneous velocity as a concept that will be undefined.
As a footnote/example introduce area of rectangle and triangle.

define symbols v and t as velocity and time
I use v(t) as a v versus t graph

Examples:

1. Rectangle for constant velocity.
3. coin toss paradox graph of v(t) and why we don't need a=acceleration=0 at the top

### Friday/Tuesday

Normal mode (harmonics)
n = 1, 2, 3:   fn = n·f0

Worked on selected topics in QB/b waves PC The frequency of normal modes on a string:

${\displaystyle frequency={\frac {\#cycles}{\#secondes}}=f}$
${\displaystyle period={\frac {\#seconds}{\#cycles}}=TorP}$ Obvioiusly ${\displaystyle fT=1}$

### Fri 7 Sep 2018

• Why Bach sounds funny on the piano

Danse Macabre:

### Mon 10 Sep: Resonances/Slidewhistle

Defined resonance and looked at a simple 3/2 resonance on slidewhistle

### Wed

We did musical harmony calculations on a spreadwheet.

### Thursday

Today we will simulate the musical fifth (p/q=3/2) and show that it is an even signal.

1. Google wikiversity saros and your friend's pet lizard to understand why the ancient Babylonians and Greeks used this mathematics to predict eclipses. This math suggests some simple multiple of 6 time steps would give us something interesting. I tried 24 and it worked (just barely).
2. The top of the first column is "t". The top of the second column is 3 (hungry every three days).
3. Below the "t" is 0 and below that is "=A2+1". Fill down.
4. Below the 3 we need a sine wave. We shall use $to fill down and to the right in the B column that we shall later move to the C column: =SIN($A2*PI()/B\$1)
5. Graph this curve as a scatter plot with smoothed curve fit.
6. If all goes will, fill the entire column to the right two columns. Of these three signals, replace the first column by the sum of the other two, and make the period of the others be 2 and 3.

### Monday 15:37, 17 September 2018 (UTC)

#### Resonance and vortex shedding

The Tacoma Narrows Bridge was destroyed by a 1:1 resonance f_1/f_2 = 1/1. It routinely happened at certain wind speeds. But wind gusts are typically irregular in frequency[2] These pictures explain what might have been going on.

#### Pictures at an exibition: Great Gate of Kiev

• https://www.youtube.com/watch?v=b8gs4TozJbQ First 60 or so seconds is the same, with brass but no "bells". Loud part ends at 1:59 and the first Bells I could find are at 2:27, but its a preview to the Bells that Mussorgsky put in the theme. An orchestral recap begins at 3:29 without bells. Finally at 4:30 you hear the Bells.

### Tue-wed 19 Sep

We developed ♠/Slide whistles and harmony in draft space. See special:permalink/1921939

### Thur 20 Sep

1. continued w slide whistle captions
2. This lab photo

### Fri 28 sep

 15 30.45 20 19.68 25 16.95 30 14.84 35 14.37 40 13.01 45 12.83
x y
0.066666667 0.032840722
0.05 0.050813008
0.04 0.05899705
0.033333333 0.067385445
0.028571429 0.069589422
0.025 0.076863951
0.022222222 0.077942323

### Mon 1 Oct: Human eye model start

Tuesday
lengths in cm.  No water.  Image prjected on screen (inverted)

454.5 cm plus/minus 0.75 cm objeect to coronal lens
13 cm pm 0.1 cm retina (image) to lens
91.5 cm pm .5 cm object height
2.5 cm pm .1 cm image height

check: 2.5/13 = 91.5/454.5

LHS = .192

RHS = .201

201/192 = 1.05


### R 4 oct Hunting the Edge of Space

Class did four questions 13:25 minutes into Nova's Hunting the Edge of Space: Hour 1. See special:permalink/1927623 and QB/e test1

### W 16:07, 10 October 2018 (UTC) Pulleys

We have lots of options today:

#### Do part II of NOVA: Hunting the Edge of Space

I don't like this too much because it is more astronomy than physics. We already did lenses.

#### NOVA: Newton's Dark Secrets

This is more appropriate for Phy1050. We will need to write multiple choice questions, watching it 15 minutes at a time.

### 22 October Monday Photoelectric effect

4. Minute physics Schrodinger's cat: https://www.youtube.com/watch?v=IOYyCHGWJq4

### Tue 23 Oct

1. Quantum Mechanics with a big-mack-17:12
2. We went over the draft: looked at pictures. Class "voted" to do radioactive decay.

### Wed 24 Oct

1. File:E14-V20-B1-zoom.gif can be viewed by clicking and running the animation. An alpha particle can be modeled as a wavefunction that bounces back and forth in side the nucleus. The amplitude of the wavefunction gradually goes to zero as the wavefunction "escapes" from the nucleus. According to the Copenhagen interpretation of quantum mechanics, the alpha-particle is neither inside nor outside the nucleus until an observation is made. This is called a "mixed state".
2. For historical purposes, Carbon-14 is useful due to its convenient half-life: http://rses.anu.edu.au/services/anu-radiocarbon-laboratory/radiocarbon-dating-background
3. Physics and Astronomy Labs/Radioactive decay with dice
4. Quantum mechanics: The wavefunction for Carbon-14 is really complictaed, but in a sense, it oscillates with an amplitude correspoinding to 100% "Exists" but decayse to 50% exists in about 6,000 years.

### Wed Oct 31

¿Dónde está Guy? я быль у врача --Guy vandegrift (discusscontribs) 14:24, 1 November 2018 (UTC)

### Thu 1 November 2018: Detector error and other loopholes

A question worth pondering: If scientists don't believe that particles think like human beings, why investigate the detector error loophole? First question: What is the detector error loophole. Class essay?

I have lots more material on Bell's theorem:

### Tues 17:24, 6 November 2018 (UTC)

Finishing part 1 of Einstein Revealed.

##### 14 Nov Final thoughts on Bell's theorem before starting Global Warming

File:Rotating coffee cup2.svg

### 14 Nov start Global warming

Quizzes are based on w:Global warming (permalink)

## Last week of class

### Final Project

• You must master the 2-state 2-symbol busy beaver.
• condensed and readable version of wikipedia:Computer article. If you give it to me by Friday, I will have it graded by Monday morning and will email your final grade with instructions on how to keep and/or improve it.
Advice: Give me something short of very high quality. Use red font to show me your prose. Email it to guy.vandegrift@wright.edu as an attached word file. Minimum of 3 pages, 5 is ideal. Optional: Multiple choice questions.
• Whether you need to attend the final on Wed 1-3 is to be determined.
• If you want to submit questions be sure to make it distinct from Special:Permalink/1863377 to QB/b_ComputerWikipedia. It's ok to take a good question and make it different, though. Also, you can add great value to questions by copy/pasting the text from the wikipedia article into the question/answers.

Either write Public Domain or give yourself a wikipedia username and we can place this under cc-by-sa.

## Footnotes

1. For those with business calc, worth mentioning that slope on an x vs t graph is velocity. We will do a lab on this.
2. equivalently, irregular in period