Wright State University Lake Campus/2017-9/Phy1050/log

Showed card game. Introduced Studyguide. Did first quiz on motion. Don't sweat these calculations if you can't do them. You have other ways to succeed in this class.

Attendance policy: Allowed to miss 15 days without penalty. Nominally, you must attend 60 days to get 100%.

${\displaystyle G={\frac {D}{55}}\times 100\%}$

and D is the days that you attend, OR 55 if you attend more than 55 days.

Polarizing filters. Maybe do another wikiquiz.

Test prep: Questions 1-14 of second quiz Special:Permalink/1415990 has been discussed. (quiz called "velocity and acceleration"

user:Guy vandegrift .. hidden

• Why constant tapping of the ball is equivalent to a constant force: w:Special:Permalink/798712661#Kinetic_theory_of_gases
• Physics_and_Astronomy_Labs/Uniform_acceleration_tapping_basketball_with_spitwads
• Data is here

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Physics and Astronomy Labs/Uniform acceleration tapping basketball with spitwads#How_Things_Work_Lake_Campus_Fall_17

https://www.youtube.com/watch?v=6ukMId5fIi0

Did you get email on test postponement? What did we do Thursday and Friday?

Want more?

• Today Test prep: Waves.
• https://www.youtube.com/watch?v=IQ1q8XvOW6g beats But this is better: https://www.youtube.com/watch?v=pRpN9uLiouI Even better: https://www.youtube.com/watch?v=vNuDxc9tZMk (stop at 3:06)

• Octave and fifth: Start at 1:27 https://www.youtube.com/watch?v=_Rg54Ie9zMQ

• Go to Studyguide: 7/16 from 1409885 to b_waves_PC. Also: NOT ON THIS TEST: What happens to the wavelength on a wave on a stretched string if the wave passes from lightweight (low density) region of the rope to a heavy (high density) rope? Question 14 on studyguide.

Talks http://www.wright.edu/~guy.vandegrift/Talks/index.htm

natural 5/3 = 1.6667... http://www.wright.edu/~guy.vandegrift/Talks/cello.mp3

scientific 2^9/12 = 1.681793...http://www.wright.edu/~guy.vandegrift/Talks/piano.mp3

Caterpillar https://www.youtube.com/watch?v=ITqv3ey3h50

as Bach wrote it http://www.wimmercello.com/images/bachs1a.gif

• Sample report: https://wright032.miraheze.org/w/index.php?title=My_first_page&oldid=41

https://phet.colorado.edu/en/simulations/category/physics/light-and-radiation

https://phet.colorado.edu/en/simulation/bending-light

https://phet.colorado.edu/en/simulation/geometric-optics

also before the next test

https://phet.colorado.edu/en/simulation/legacy/wave-interference

I like this one

https://academo.org/demos/wave-interference-beat-frequency/

• $1.50 is not too much to charge, but awkward to pay: https://www.teacherspayteachers.com/Product/Isaac-Newton-PBS-Dark-Secrets-Guided-Viewing-Questions-1703344
• Copyrighted and not right for college, but available at https://www-tc.pbs.org/wgbh/nova/education/activities/pdf/3217_newton.pdf

File:Bisection_method.svg and wikipedia:Bisection method and Newton's cannon "${\displaystyle 6250m/s<v_{crit}<7000m/s}$ 4 October 2017 At 6250 we missed the center of the cannon by approximately on ball diameter. At 6200 it seemed to go higher. The for this second one was 3min32sec=212sec

4411 <Min <4411.5

• http://www.wright.edu/~guy.vandegrift/wikifiles/NewtonCannon.xlsx
• http://www.xuru.org/rt/pr.asp is better than Excel for curve fitting
• http://www.wright.edu/~guy.vandegrift/wikifiles/NewtonCannon.xlsx
• http://waowen.screaming.net/revision/force&motion/ncananim.htm
• PhET curve-fitting and PhEt least-squares-regression

Procedure:

1. Measure distance "as crow flies" for v = 1000 and 4000 m/s.
2. Predict distance for v=2000. Make a sketch showing how a graph and similar triangles would permit you to find a formula. You can also get the formula by something called Regression_analysis
3. Measure and calculate Big/Small and also percent error. The latter is (Measured−True)/True. You can report Big/Small as off by a factor of .... For small errors (less than about 10% or so, they essentially give the same information).
4. Fit your three points to a parabola. It's best not to use Excel curve fit. There is an Excel extension, but it is more convenient to search the internet for "regression" fitting.
5. Now use your parabola to predict the distance for v=3000. Measure and compare as before.

We collected this data (USING A REDUCED IMAGE ON THE SCREEN):

initial
speed  DISTANCE
m/s     CM
1000	7.2
4000	36.9
2000	12.4
3000	19.9

• #Newton's_cannon_alarm_clock
• https://www.nde-ed.org/EducationResources/HighSchool/Radiography/hs_rad_index.htm

Start here: https://www.nde-ed.org/EducationResources/HighSchool/Radiography/chemicalformula.htm

See w:User:Guy_vandegrift/Lectures/Nuclear_power

Lifted from special:permalink/1752746:

• See also https://www.dctech.com/physics/notes/music/fractionscale2.png
• Between 1 and 2, and going down from the first row I get:

{3/2, 4/3, 5/3, 5/4, 6/5, 7/4, 7/5, 7/6, 8/5, 8/7}
  V    IV   VI  III  iii  *     ?    ?   vi    ?

Here I used capital Romans for major and lower case for minor. The 7/4 is the devil's triad.

expanded broomstick image

• A model consists of one or more mathematical equations that attempt to describe reality.^[1][2][3]