Doppler effect on the railroad line; Homework 13

In lecture, I gave you all this link, http://youtu.be/w0AadZ1bs78 for some noticeable Doppler shift in sound waves.

Here is another nifty YouTube for Doppler shift:



Homework 13 will be ready by lunchtime Saturday or sooner.

Volcanic outgassing, Canary Islands

Carbon dioxide. Notice the dead fish -- maybe too much CO₂ dissolved in the water?

Doppler shift, freight trains

There are tons of rail fans uploading to YouTube, and many of their videos let you listen to a nice Doppler shift. Here is one we listened to in lecture today -- one among zillions that you could listen to.



Listen to the trains blow their horn, in the first 45 sec. or so, then a bell ringing at 5:20 and and an excellent horn at 7:15.

Standing waves from spring semester

Take a look at the standing wave demonstration from last spring, Gloria and Lee operating the Slinky.
You can read more about standing waves and harmonics on pp. 129-130 of our present textbook.

Here is another YouTube, with Amanda and Rylee. They actually get up to the 2nd excited state. Nice.

This morning's experiment

Here is a quick YouTube of our experiment with Asa this morning: what is his motion on the skateboard, in terms of distance, time and speed?

Angular momentum videos

You now can view the angular momentum demonstrations from Thursday lecture, in iTunes U and in YouTube.



Also available are the last two pendulum videos, as promised.





I will be asking questions about all of these demonstrations on Exam 2.

Pendulum 1, how to measure its period.

Here is the timing method for Pendulum 1.

Pendula and oscillation period

I will be posting several videos from the long pendulum demonstration on Thursday, Feb. 17. Here is the first one, from the beginning of the demonstration.



This video is also available inside our iTunes U area.

Today's demonstration

We did a falling five dollar bill demonstration in lecture today, from which we began a discussion of motion, velocity and acceleration.



Thanks, Manny, for being a good sport and helping us out as a volunteer.

Also, the digital video versions are uploaded into iTunes U.

Helium

Now the helium spectrum. Both sections need to be familiar with this.



Higher definition versions are in iTunes U.

YouTube of hydrogen spectrum

Here are the demonstrations of thermal and hydrogen spectra from Tuesday's lecture. All PSC1121 students, both lecture sections, must view this.



One of the interesting things about this quantum spectrum of hydrogen: it displays almost all the physics concepts we will study this semester. So you can think of this demonstration as the goal of our quest, how to understand the quantum world of hydrogen, the most abundant element in the visible universe.

Some hair trouble

Some of the Van de Graaff generator video (by Amanda) is on YouTube. More will be forthcoming. Link to our YouTube is also on Webcourses home page.

Standing waves

From today's lecture, a demonstration of standing waves, using a flexible coil spring.:

CORRECTION -- for students in morning section: You should add up the three time measurements and divide by 30, since they each measured ten full cycles. This moves the decimal point on space to the left in the answer you might have written down in your morning section lecture notes.

Astounding

Ultraviolet and magnetic fields. Sweeeeeet.

Why you can, must and shall become physics dominators in 2010.

This highly technical YouTube shows why each PSC1121 student must strive to crush Exam 4 and become a physics dominator at the Chuck Norris level.

Tsunami link in Webcourses

We mentioned a tsunami website in lecture today. I just set up a WebLink to it in Webcourses on the home page. It is not USGS, though -- it is from NOAA / PMEL / Center for Tsunami Research. Sweeeet.

Homework 4

Homework 4 is now available for everybody. As I have mentioned in lecture, it has different due dates for each section, even though Webcourses only shows one "End" day and time. You must go by what I have set up:

1. Homework 4 disappears and is unavailable at 9:30 AM on Monday for the MWF section 0004.
2. At 10:30 AM on Tuesday, the HW 4 assignment disappears for everybody in the T/Th section 0003.

It is a pain in the neck, but all we can do is get used to thinking in these terms.

Don't worry -- your brain will click with it an a week or two like you are on autopilot. Good.

P.S. I will be working on some YouTube of the falling meter stick today plus your first round of CPS scores. Keep your eyes open.

Homework 2 is now UP.

All sections:

Homework 2 is now up. There is a special challenge question that has a Youtube attached and requires a bit of reading ahead. As with all homework, this assignment will be due at the beginning of your next lecture: Tuesday, 10:30 AM for section 0003, and Wednesday at 9:30 AM for section 0004.

Go for it!

Spectral lines of hydrogen

We have this video to refresh your mind about the spectral lines of hydrogen.



We viewed hydrogen's spectrum in class on Thursday and Friday. One of the homework questions is about the spectrum.