Wright State University Lake Campus/2016-9/Phy1050/log
- 1 29-Aug
- 2 5-Sep
- 3 12-Sep Lab: Malus law by hand (error analysis)
- 4 19-Sep Excel/stdev Wikifarm link
- 5 26-Sep
- 6 3-Oct labs: Rule of 72, Nuclear reactors
- 7 10-Oct Inkscape object to be edited
- 8 17-Oct
- 9 24-Oct Global warming and longitude
- 10 31-Oct
- 11 7-Nov
- 12 14-Nov computers
- 13 21-Nov
- 14 28-Nov
- 15 5-Dec
- 16 12-Dec
How to select username
- 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
- 1504188 to b_motionSimpleArithmetic SolutionsOn the first quiz, practice on this Quizbank version Done 5/12 from
- Got to #16: 8/19 from 1415990 to b_velocityAcceleration
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%.
|raw data from last week's lab|
- Friday: Started Wikiversity:Private_wiki-farms. For your convenience, just copy/paste this into your user page.
- 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.
Strength_of_materials/Lesson_8 idea for Friday lab.
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
- w:RBMK, w:Chernobyl_Nuclear_Power_Plant, w:Chernobyl_disaster and w:Effects of the Chernobyl disaster
- w:Breeder reactor
#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.
See also w:Linear no-threshold model
10-Oct Inkscape object to be edited
Click this and download:File:Object_to_be_edited.svg
- 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.
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!
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:
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
24-Oct Global warming and longitude
- 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:
- Mythbusters Global Warming
- advanced pdf file with questions
- Equations for planetary temperatures
- 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:
- 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.
w:WLG we let vA=1 and A=1. Plot
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)
Looking at w:Positive feedback or for copypasting:
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.
@J0031723: - I am moving your housing bubble text to Wright State University Lake Campus/2016-1/Phy1060/log/j0031723
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)