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

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### 29-Aug

#### How to select username

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

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

### 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.

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:
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

[[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.
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

Strength_of_materials/Lesson_8 idea for Friday lab.

### 21-Nov

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

### 28-Nov

#### 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)