Wright State University Lake Campus/2016-1/Phy2400/log

< Wright State University Lake Campus < 2016-1 < Phy2400

This is the course Journal where I try to document what we do each day. It has this subpage where I keep stuff

monday 1/11 Looked at first quiz)

First quiz..interupted by music lesson

1/12 tue lab

dentists in celina

1/13 Wed registration on Wikiversity

Show you your personal S (subspace) under the log (this course journal).

Study guide up to where we did prob 3 in first quiz in chapter 2 (definitions): 2.07 mph/sec.

Will do unit conversion on thursday.

1/14 Thursday finished registration

Everybody should:

Be registered with a a Template:EduV/enroll filled out on main course page.Y Done
Have the link to the main course page on their user page. To do this, just copy
[[Wright State University Lake Campus/2016-1/Phy2400]]
onto your user page and check it to ensure that it works. Y Done
Install visual editor from Wikiversity.

Address bar:Preferences:Beta feature:Visual editor

Done

Do a variation of the Fermi question on piano turners in NYC (together in class).
~~Does anybody have any dinosaur piss inside them right now? (together in class).~~
Find and insert image into your userspace.
1. New tab open wikimedia commmons using google (commons is key)
2. find random file and paste the entire title (address) file:xxxxxx.gif or jpeg
3. paste into user page
4. turn it into a link with: double square brackets and pipe with instructions.

Homework

Propose a format for the organization of your '''.S''' log subpage.

1/18 tue lab spitwads and curve fitting

Physics_and_Astronomy_Labs/Uniform_acceleration_tapping_basketball_with_spitwads Let's just look at the curve fitting question today. Instructor opened Excel and copy paste the spreadsheet. Found standard deviation.

Did basketball-tennis ball energy exchange using Earth's gravity.

Important announcement

Tuesday's and Thursdays are lab days and I need to take attendance. Usually this will be in the form of a 1-page report on blank typing paper. Leave a 3/4 inch margin all around and do not include your real identity inside that space.

At the very top (inside the 3/4 inch margin where it can be deleted): First last name and date.
At the very bottom (also in the margin where it can be cut): Name of today's lab and real name.
In the lower right hand corner, but outside the margins where it will be seen by viewers, you are strongly encouraged to write "I release to public domain - username" This way you or I can post to commons. I will not post handwritten diagrams without your permission.
Within 24 hours you need to start a journal inside your log's .S personal subpage. Write a one sentence summary of every lab that you attend.

You need to follow the aforementioned instructions so that I can give you a good lab grade

Class discussion: It would be easy for you to copy somebody else's lab report. How can I make this not sound so bad?

Put this into your best prose in your personal subpage (i.e. your .S page). This is a high priority task.

1/20 Wed (lecture) PREPARE FOR TEST ONE WEEK FROM TODAY

Can you all get to Wright State University Lake Campus/2016-1/Phy2400?
Test 1 is one week from today. We will review during both labs Thursday and Tuesday.
On Simple Arithemetic we only did the first 5 questions.

2/2 Tues

2/4

Hand sketch of three string problem to estimate T1 if theta_1 is 18 deg, theta_3 is 34 deg and T_3 os 24 N.
Each group picks a problem from Physics equations/04-Dynamics: Force and Newton's Laws/Q:tensions/Testbank, solves it and puts it on the board.

2/23

Practice polynomial integration on http://math.ly/calculus/polynomial-definite-integrals/pydbbzcnyb/
Physics and Astronomy Labs/Hooke's law and Young's modulus. Which of the two graphs do you like best?

3/13 Newton's Dark Secrets

Questions posed by students

11 minutes:

Who was Newton's roomate? what college? How long there?
What coincidence is involved with the year somebody died and/or was born?
How did Newton disagree with Descartes?
What did Copernicus have to do with Astronomy at the time?
What interested Newton as a child?
Newton was interested in predicting something very important. What? When will it happen?

26 minutes

What interested Newton about Alchemy?
How did Newton's telescope differ from previous ones?
What first triggered Newton's feud with Hooke?
Where did Newton get the word "gravity"?
Why did Newton leave the univeristy and go home?
Did the university close when Newton left?
At what age did Newton invent calculus?
What was the magnification of Newton's telescope?
What discovery led to Newton's invitation to join the Royal Society?

afterwords:

Why did Newton take up Alchemy?

How have historians viewed Newton's efforts in Alchemy?

People know great truths in the ancient past. Greek myths were encoded recipients.

The green lion and sordid whore.

File:Glacial striation 21145.JPG

The net was produced. Alloy with striated netlike surface.

34 minutes

3/24 Centripetal force lab

instructions

Sketch the device in hanging mode and in swinging mode. Make two different sketches in "profile" view (i.e., from the side).In hanging mode, a mass, M, is attached by a string over the pulley.
Label the hanging mass M.
Do not sketch the counterweight, but label the rotating mass as m.
Label the radius of orbit as r.
Sketch and label the horizontal and vertical support rods (labeling both as "rod:", as well as the spring.
Label the force that the spring exerts on the rotating mass as F_s.
1. What direction does this force go?
In the rotating mode sketch, include the pointer rod. In rotating mode the object is moving at speed v, place that letter on the diagram.
1. What is the purpose of this pointer rod? (Hint: remove the hanging weight M and rotate)
2. Why is it important that the two support rods, the spring and the vertical string to m make a perfect rectangle?
3. Make two free body diagrams: (1) when it is rotating with the shape a perfect rectangle and (2) with the shape not a rectangles.
4. Why is the net force in the x direction not zero?
5. Write down two equations for F_s. Neither involves the "spring constant". Select from your list of variables: m, M, g, r, v, a.
Your working equation is ma=Mg. Two can be measured and one is known. Write down these values: m=?, M=?, g=9.8ms². The class measured m=.4558 kg, and M = .211 kg.-->
How are we going to measure a? Force divided by mass is one answer, but to verify we need an independent measurement.
Can we measure v if we know period. Let the period (of one revolution) be called T. It is easier to measure the period of 20 revolutions. Class got 20T = 26.8 seconds.

Calculate r, v, and a+ r= .18m, v=? and a=?

3/29 Solutions to questions 13, 14, 15

Solutions to questions 13, 14, 15 on How things work college course/Waves (Physics Classroom) can be found here
Video of pulse interference (skip to halfway point)
Pulse interference on Physics Classroom

Musical harmony

Why Bach sounds funny on the piano (talk)
Ear training to hear the need for the equal tempered scale.
What about the 5:7 resonance?

Two problems: 7 is a large prime number, and also 5/7≈10/7 (both close to the square root of two, or the logarithmic midpoint of the octave (factor of 2). As far as I know, nobody has investigated whether the proximity of two ratios of nearly the same order could cause this interval to sound harsh.
Download three versions of the Devils tritone: 10:7 (617.49 cents) - 7:5 (582.51 cents) - √2:1 (600 cents)
La danse macabre is one of many musical works that features this interval of dubious consonance.
Wikipedia:Scordatura describes the alternate tuning of the solo violinist that replaces one of the fifths by a fourth. See also Wikipedia:Danse_macabre_(Saint-Saëns) for this rendition on commons.
See Wiktionary:macabre for the definition and pronunciation of this word.

4/5 lab Tues: echo string

Do this quiz in class (solutions)

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