Wright State University Lake Campus/2016-9/Phy1050/log

29-Aug

How to select username

Your account will span Wikiversity, Wikipedia, Commons, and Wikibooks.

No username can be anonymous on this campus. Your classmates will likely discover your identity. One option is to quasi-violate Wikimedia policy and have a "public" username, and different private one.
You are advised not to worry about previous consideration and pick a "permanent" username that you might use for the rest of your life. Pick an unembarassing username that not too long, avoid spaces and other odd symbols.

You have three good choices for your password:

Use one you already know
Use one that you might forget, but give me the password. (Never give your "important" passwords to anybody; but keep in mind that very little harm is done if you give me your password
Use one that you might forget, but give them your email address. I am not certain, but it is my understanding that Wikimedia will retrieve your password if they have your email address.

Help for test 1

Y Done 5/12 from 1504188 to b_motionSimpleArithmetic SolutionsOn the first quiz, practice on this Quizbank version

Got to #16: 8/19 from 1415990 to b_velocityAcceleration

7/16 from 1409885 to b_waves_PC
- Hint on question 9

5-Sep

Got to question 3 on Physics equations/25-Geometric Optics/Q:image

Lab: Echo, reverb and anechoic. Also ray diagrams

Reverb, echo and anechoic

Ray diagrams for lenses

12-Sep Lab: Malus law by hand (error analysis)

In this lab we will understand the process by which two polarizers block energy. It can be shown that the amount of energy that passes is proportional to the square of the projection ratio, where the projection is known as w:vector projection. We will do this by hand and discuss the random error, averaged over the entire class.

Learn to: divide into 8 parts, make 30, 45, and 60 degrees.
Find the square root of the pass ratio at 30 degrees (it's just the projection for unit hypothesis).

Online wikitable maker at http://mlei.net/shared/tool/csv-wiki.htm

The bottom row shows the weighted averages and the standard deviation of the calculated pass rate from the data collected in class. We got the pass rate to be 86.4% ±9.8%.

small	big	N	ratio^2	dev^2	N*ratio^2	N*dev^2
6.5	8	1	0.8125	0.002629527	0.8125	0.002629527
13	16	1	0.8125	0.002629527	0.8125	0.002629527
16	16	1	1	0.018556186	1	0.018556186
7	8	10	0.875	0.000125913	8.75	0.001259129
6	8	3	0.75	0.01294564	2.25	0.03883692
6	9	1	0.666666667	0.038853236	0.666666667	0.038853236
7.5	6.5	1	1.153846154	0.084139007	1.153846154	0.084139007
8	9	1	0.888888889	0.000630511	0.888888889	0.000630511
16	17	1	0.941176471	0.005990383	0.941176471	0.005990383
		20		averages	0.864	0.098

Project:

w:Draft_talk:Miraheze

19-Sep Excel/stdev Wikifarm link

raw data from last week's lab

small	big	N
6.5	8	1
13	16	1
16	16	1
6	9	1
7.5	6.5	1
8	9	1
16	17	1	count
6	8	3	1
6	8	3	2
6	8	3	3
7	8	10	1
7	8	10	2
7	8	10	3
7	8	10	4
7	8	10	5
7	8	10	6
7	8	10	7
7	8	10	8
7	8	10	9
7	8	10	10

Friday: Started Wikiversity:Private_wiki-farms. For your convenience, just copy/paste this into your user page.

[[Wikiversity:Private_wiki-farms]]

Ideas for projects (keep in mind that most students will get As or Bs on their projects if they show decent effort, and also that its only worth 10% of the grade. But ... on rare occasions, one or two students have substitued an outstanding project for poor test scores.

Wikiversity:Private_wiki-farms as already mentioned.
Commentary on a current quiz: How to remember the answers; why the instructor thought they were interesting.

26-Sep

Strength_of_materials/Lesson_8 idea for Friday lab.

Thursday lab

w:Cooling_tower w:Nuclear_power_plant

Magnox_reactor_schematic.svg
Tmi-2_schematic.svg
Nuclear power plant-pressurized water reactor-PWR.png

http://encyclopedia.che.engin.umich.edu/Pages/HeatTransfer/CoolingTowers/CoolingTowers.html

3-Oct labs: Rule of 72, Nuclear reactors

Tuesday lab: Rule of 72(?). Double $ in

70 years at 1%

35 years at 2%

10 years at 7%

7 years 10%

2 years at 35% ?? (questionable)

1 year at 70%? Not exactly

Thursday:

#2 Why we need other wikis besides Wikipedia

From RBMK#High_positive_void_coefficient we have:

Because of this lower density (of mass, and consequently of atom nuclei able to absorb neutrons), light water's neutron-absorption capability practically disappears when it boils. This allows more neutrons to fission more U-235 nuclei and thereby increase the reactor power, which leads to higher temperatures that boil even more water, creating a thermal feedback loop.

Assignment: Rewrite this paragraph. Assume knoledge of positive feedback.

What goes wrong: water boils to too much steam.

Reactor gets hotter, and a hotter reactor boils more water.

Why does more steam (i.e. less water) cause the reactor to burn hotter?

The water absorbs the neutrons, thereby allowing more neutrons to induce fission.

10-Oct Inkscape object to be edited

Click this and download:File:Object_to_be_edited.svg

Breeder reactors: Starting at uranium-238 (the "useless" isotope), the neutron capture creates isotopes of plutonium, americium, and curium. All of these isotopes can burned as fuel if the reactor is designed to be a Breeder reactor

Thursday's lab

Go to commons select a jpg or png image and place in dropbox 2 of Pilot phy1050.
Spend 30 minutes trying to get info on why a country like Iran with "peaceful" nuclear energy program can so easily convert it into a weapon's program. Here is my confusion: The ability to enhance natural urnanium to reactor grade leads automatically to the ability to create the much higher weapon's grade uranium. I also know that nuclear power plants can be used to "breed" weapons grade plutonium. Put your 30 minutes of effort either on your .S page, or in dropbox 3 which will be creatd in 7 minutes.

17-Oct

Breeders versus refinement in nuclear proliferation

What do we know about Breeder reactor technology and nuclear proliferation? Do "newbies" in the nuclear club "breed" the fissile material or do they refine the Uranium 238 ore to extract the U-235? I googled nuclear proliferation plutonium vs uranium and got this from MITOpenCourseWare. Thank-you MIT!

https://ocw.mit.edu/ans7870/STS/STS.069/f02/sts069new/dwang/plutonium.pdf

How many piano tuners?

The population of Celina was 10,376 in 2013 and the popululation of Mercer county was 40,784. How many dentists are there in Celina? See w:Fermi question, and also my "equation" approach: ${\frac {x_{1}\,persons}{1\,Celina}}\cdot ={\frac {x_{1}\,persons}{1\,Celina}}\cdot {\frac {x_{2}\,visits/year}{person}}\cdot {\frac {1dentist}{x_{3}\,visits/day}}\cdot {\frac {year}{x_{4}\,days}}={\frac {?\,dentists}{Celina}}$

?={\frac {x_{1}x_{2}}{x_{3}x_{4}}}

How far south do you need to move to raise the average temperature by 1 degree (F)?

5/160 deg/mile = 1 deg/32 miles. Rough estimate for future growth 3F/century = 3/100 deg/year = 1/30 deg/year

{\frac {32\;miles}{deg}}\cdot {\frac {1\;deg}{30\;year}}\approx 1\;mile/year

Source:http://www.eldoradocountyweather.com/climate/US%20Climate%20Maps/Lower%2048%20States/Temperature/Mean%20Daily%20Average/us-annual-daily-average-temperature.html

24-Oct Global warming and longitude

sextant]]
Measurng latitude]]
time zones
Longcase clock

Estimates of rise

nationalgeographi.com (google) Average temperatures have climbed 1.4 degrees Fahrenheit (0.8 degree Celsius) around the world since 1880.
Summary of findings - Muller (berkeleyearth.org)

Muller lectures:

31-Oct

Tuesday

Thursday: I alway find simple arguments worth thinking about, especially when those making the arguments do not attempt to overstate their case. Two such arguments can be found in a climateblog I once kept. The arguments were made many years ago, and Muller, who seems to be an honest broker in this debate does not seem to be convinced by these arguments in recent years:

Akasofu and recovery from the "Little Ice Age". Note the relevence of Akasofu's graph to this misleading graph that is still on Wikipedia. Note also that the unexplained rises and dips continue to the very end of this (first and correct) graph on the same Wikipedia article.
Paltridge: feedback uncertainty When the graph of a prediction is of a certain form, you can't trust the results. We will consider finding the area and volume of a unit square and cube to understand this effect.

7-Nov

When he talks into the microphone the sound is directed out of the microphone. If there is positive feedback, some of the sound enters the microphone.

w:WLG we let vA=1 and A=1. Plot

${\frac {1}{1-f}}$

14-Nov computers

Jacquard_looms

Tuesday: Computer [] slide rule turing machine Pikering's "harem" (of comuters)

https://xxxclairewilliamsxxx.wordpress.com/tag/punched-hole-cards/ is blacklisted on Wikiversity. Fortunatly we have plenty of images on commons:Category:Jacquard_looms and even a movie at

Project w 4 students: Positive feedback (Wed)

with user:Cantelli25 user:W062bls user:Mattsief10 user:16giere

Looking at w:Positive feedback or for copypasting: [[w:Positive feedback]]

V_{\mathrm {out} }=A_{\mathrm {OL} }(V_{\mathrm {in} }-\beta \cdot V_{\mathrm {out} })

Possible project for next time: Look at w:Feedback#Negative_feedback. Visit the talk page to w:Positive feedback and explain that we decided to put the image there. Thank the editor for his advice (really kiss a$$ here and be sure to include a link to the page.). Then write a caption and/or text for the image and let's play it safe and put it on the talk page, along with a sisterinterline to our course page.

21-Nov

@J0031723: - I am moving your housing bubble text to Wright State University Lake Campus/2016-1/Phy1060/log/j0031723

28-Nov

short youtube on turing machine actual model

Talk page of Wikipedia:Positive feedback

Those present (18:48, 30 November 2016 (UTC)) helped with this. (Go into edit mode and copy this link into your log.S report)