schedules staff lecture videos exams problem sets general information feedback tutoring previous years lecture supplements

#### ANNOUNCEMENTS

May 30, 2002

I'll be happy to answer questions.

\\/\//////@lter

May 23, 2002
Based on 175 Finals, class average is 52 (as of this time, Thursday 8 AM, we are still entering grades in the data base).

May 15, 2002
If you missed it, here are pictures of the MIT Muses serenading Walter.

May 11, 2002
Lecture Monday, May 13
For those of you who have access to Giancoli, Volume I: Sect. 16-7 covers the Doppler effect of sound very well.

May 10, 2002
Five Planets
Don't miss this opportunity! Click on apod.

May 8, 2002
Exam 3

Based on the three exams alone (not counting Homework, Quizzes and possible extra credit for your motor), the dividing line between C and D would be somewhere in the range 135-138 (this is the SUM of your three grades with a maximum of 300).

\\/\/////@lter

May 3, 2002
Homework assignment #10 contains only 4 problems. It is due Friday, May 10, which is the latest date allowed by MIT rules.

May 2, 2002
Exam 3
Our third exam will be on Monday, May 6. There will be two reviews. Several tests given in previous years are available.

A tutor will be available Sunday, May 5 from 12-3 pm in room 4-163.

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April 30, 2002
Rainbows, Haloes and Glories
For many magnificent pictures, look at http://www.photovault.com/Link/Nature/zRainbows.html.

A nice glory can be seen on "apod" April 17, 2002.
For the physics of rainbows, look at
http://www.unidata.ucar.edu/staff/blynds/rnbw.html

Sundogs
See "apod" Jan 14, 2002.

April 26, 2002
Two Great Pictures
The same comet and the Space Station can be seen here.

April 23, 2002
Comets have two Tails
Comets consist of CO2 (it's a "dirty snow ball" the size of Manhattan). As discussed in lectures (4/24) when they get close to the sun, comets develop two tails. The white/yellowish tail is due to radiation pressure (the white light is scattered sunlight). The blue tail results from the solar wind which ionizes the CO2 molecules; blue light is emitted through de-excitation of the excited molecules. Hale-Bopp (in April 1997) showed the two tails in a very dramatic way; click here.

April 17, 2002
A few students have expressed their unhappiness about the fact that the due date of HW #7 was Wed (4/17). I wish I could have given you 9 days for this assignment, but the consequence would have been that we could then not cover 3 assignments on Exam 3.

I always allow at least 7 days for HW (as is the case for #7), and I keep a minimum of 5 days between topics covered on HW and in lectures (this is also the case for #7). I also observe time students need to prepare for an exam. Consequently, there are only 10 assignments.

I realize that you lost one recitation this week. That has happened before; students lost their Tue (2/19) recitation. I therefore kept #7 rather short.

\\/\/////////@lter

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April 16, 2002
Musical Instruments needed on Friday, April 19

I need a few musical instruments in class Friday, April 19. I would prefer a violin, and a saxophone, (or trumpet, or horn or clarinet), but I am willing to listen to other offers. You do not have to be a "super" musician! Please contact me asap by e-mail: lewin@mit.edu.

Thanks, \\/\//////@lter Lewin

April 12, 2002
If I had to decide now on a passing course grade, using only the grades of Exam 1 and Exam 2, (not counting HW, quizzes, and extra motor credit), students whose total score (sum of the two exam grades, with a maximum of 200) is 80 or less would get D's and F's. The dividing line between D and F would be in the vicinity of 70.

\\/\/////@lter Lewin

April 8, 2002
Exam 2
For details on our second exam, click here. The emphasis of my exams is largely on concepts, not on math.

Professor Belcher kindly made available some of his exams from 1992-1994 (including finals); we have no solutions for them. Click here to enter.

In addition, there are eight old exams (covering overlapping material with our exam on Wednesday) from 1985-1990 (exams two and three), INCLUDING SOLUTIONS (exams two and three). Old exams and solutions are only available in PDF.

Keep in mind that the material covered in 8.02 differs somewhat from year to year, depending on who is lecturing the course. I also want to stress that I am not responsible for the exams. Reference is made in some to "Kirchhoff's loop rule", where this rule DOES NOT apply (see the Lecture Supplement of April 1).

\\/\/////@lter Lewin

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April 5, 2002
Motional EMF in Space
A striking example of an induced EMF due to a changing magnetic flux is NASA's experiment with a 20 km long tether attached to the Shuttle. For more details, click here.

April 4, 2002
Motors can be picked up in 4-309. Someone is there most (but not all) of the time. If we were unable to get your motor running, we placed a "?" on your motor, and we will give you a chance to show us how it works. We will then test it (in 4-309) in your presence and credit you. This will have to be done before April 10.

April 2, 2002
TODAY, April 2, is the GREAT 8.02 Motor Contest from 1-5 PM in 26-110. For details click here. It is not necessary that you bring your own battery. We will have 1.5 Volt power supplies which we will use to test your motors. See you there!
\\/\//////@lter

March 22, 2002
===>> Friday's Vacation Special <<===
As a follow-up on my lecture of March 22, I suggest you look at some wonderful Aurora pictures and also visit some of the Maglev sites.

Aurora Borealis (and Australis)
Look at APOD Nov. 14 and Dec. 3, 2001, Jan. 21 and March 20, 2002.
Look at EPOD April 23, June 25, Nov. 2, 2001, and March 19, 2002.
To access specific dates, scroll down and enter "Archive".
Also look at Theta Aurora and Oval Aurora, located at http://www-pi.physics.uiowa.edu/sai/gallery/.

Magnetic Levitation
Maglev (High-Speed Bullet Trains)
Look at http://www.rtri.or.jp/rd/maglev/html/english/maglev_frame_E.html and look at some of the pictures. Look also at http://www.howstuffworks.com/maglev-train.htm.

Enjoy!

\\/\///////@lter Lewin

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March 11, 2002
Do some Physics, and have FUN!
Click here and look at magnetic fields created by two current loops. You can change the size and orientation of the loops. Try to create a "magnetic bottle" (that is a near constant B-field in a region of space between two current loops).

March 6, 2002
Click here if you are interested in the solutions to Exam 1.

March 1, 2002
Our first Exam is on Wednesday, March 6. For detailed information, click here.

Lectures 1 - 10 can be viewed on the web from any Athena workstation; click on "lecture videos". My Exam Review Lecture can be viewed on MIT Cable TV (channel 10) beginning at 5 PM today (Monday). The lecture will start every hour on the hour; this will continue day and night till Wednesday morning 11 AM.

Unfortunately no exams can be found under "previous years". However, I managed to find a routing to two past exams (one without and one with solutions). Click on http://web.mit.edu/8.02t/www/coursedocs/coursematerial/week4day3.
The file is "practice1.pdf" (forget problem 4). Also click on http://web.media.mit.edu/~mcbride/802Exam1Spring01.pdf. This is the best I was able to do for you. If you need help, see your instructors and the tutors. I too will make myself available as much as possible!

Good Luck!
\\/\//////@lter Lewin

Feb. 27, 2002
Students who did not attend Friday's lecture (March 1), can pick up a motor kit in room 4-309 (someone is there most of the time).

Feb. 25, 2002
There is a typo in eq. (10) of the Lecture Supplement of Feb. 22:
"sigma(ind)" should be "sigma(free)". We have made the correction in the present version.

Feb. 21, 2002
Two Lecture Supplements (2/20 and 2/22) are now available.

Feb. 18, 2002
LIGHTNING (Feb. 19 Lecture)
Look at some "Astronomy Pictures of the Day" - http://antwrp.gsfc.nasa.gov/apod/.
At the very bottom, click on "Archive". Look at the pictures of Nov 11, 1995 and June 16, 1999. These are great examples of Sprites, very high up in the atmosphere.

Also visit some "Earth Science Pictures of the Day" - http://epod.usra.edu/.
Nice examples of lightning are May 22 and June 18, 2001. Bookmark both "apod" and "epod"; I look every day at "apod".

Enjoy!
\\/\///////@lter Lewin

Feb. 9, 2002
Want to do Physics and have some Fun?

Click on "previous years", "8.02T", "Current Assignment", "Simulations", and finally click on the image of the Electric Vector Field Applet. You can create wonderful electric field line patterns. You can change the polarity and the magnitude of the charges (it's easy to create a dipole field). Try to guess approximate locations where the E-field is zero (see problem 1.2). "Iron filings" do not work for E-fields, but "grass seeds" do, as demonstrated in lectures.

Enjoy!
\\/\//////@lter Lewin

Feb. 2, 2002
Recitations will start Tue Feb 5, our first lecture will be Wed Feb 6. The following is of particular importance:

* The Ground Rules, see general information
* First Homework Assignment, see problem sets
* Recitation Schedules, see schedules
* Course Syllabus, see schedules

Enjoy the course!
\\/\/////@lter Lewin

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