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

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29-Aug[edit | edit source]

How to select username[edit | edit source]

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

  1. 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.
  2. 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:
  1. Use one you already know
  2. 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
  3. 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[edit | edit source]

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

5-Sep[edit | edit source]

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

Lab: Echo, reverb and anechoic. Also ray diagrams[edit | edit source]

Reverb, echo and anechoic

Ray diagrams for lenses

12-Sep Lab: Malus law by hand (error analysis)[edit | edit source]

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.

  1. Learn to: divide into 8 parts, make 30, 45, and 60 degrees.
  2. 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:


19-Sep Excel/stdev Wikifarm link[edit | edit source]

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


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

26-Sep[edit | edit source]

Strength_of_materials/Lesson_8 idea for Friday lab.

Thursday lab[edit | edit source]

w:Cooling_tower w:Nuclear_power_plant


3-Oct labs: Rule of 72, Nuclear reactors[edit | edit source]

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


  1. w:Pressurized_water_reactor
  2. w:RBMK, w:Chernobyl_Nuclear_Power_Plant, w:Chernobyl_disaster and w:Effects of the Chernobyl disaster
  3. w:Breeder reactor

#2 Why we need other wikis besides Wikipedia[edit | edit source]

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.

See also w:Linear no-threshold model

10-Oct Inkscape object to be edited[edit | edit source]

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[edit | edit source]

  1. Go to commons select a jpg or png image and place in dropbox 2 of Pilot phy1050.
  2. 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[edit | edit source]

Breeders versus refinement in nuclear proliferation[edit | edit source]

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!


How many piano tuners?[edit | edit source]

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:

How far south do you need to move to raise the average temperature by 1 degree (F)?[edit | edit source]

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


24-Oct Global warming and longitude[edit | edit source]

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

  • Muller lectures:
  1. "hide the decline"
  2. "I was wrong"

31-Oct[edit | edit source]

  • Tuesday
  1. Mythbusters Global Warming
  2. advanced pdf file with questions
  3. Equations for planetary temperatures
  4. Introduction to the Stefan Boltzman law and planetary temperatures
  • 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:
  1. 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.
  2. 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[edit | edit source]

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

14-Nov computers[edit | edit source]


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)[edit | edit source]

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

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

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[edit | edit source]

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

28-Nov[edit | edit source]

short youtube on turing machine actual model

Talk page of Wikipedia:Positive feedback[edit | edit source]

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

About the reports[edit | edit source]

5-Dec[edit | edit source]

Optional project[edit | edit source]

See Private_Wiki_Project#Essay

12-Dec[edit | edit source]