12/8 Test 5 Solutions as well as the three
"Summary Sheets" from the Notes are now
available at the Noble Library Copy Center
12/6 WARNING!! TEXT MISLEADING ON PAGE 949
Equations (35-31) and (35-32) on page 949 of our
text are potentially misleading. Equation (35-31) is
for instantaneous power, i.e. power as a function
of time, and equation (35-32) is for maximum power.
The right equation for average power (which is almost
always the value given in any problem) is
<P> = I(4piR²).
Example 35-5 is especially misleading since they use
a 100 W bulb and treat the problem as if this 100 W
was the maximum power of the bulb, when in any
reasonable case, the 100 W would be the average power.
The book returns to sanity in HW problems 22, 31
(not assigned), and 32. In each of these problems the
book gives an emission power which in each case is an
average power.
12/1 Message to Tuesday Recitations
Due to the missed quiz at the first recitation
meeting, the Tuesday Recitations WILL HAVE A QUIZ
during the last recitation meetings on Dec 7th.
This will make 14 quizzes for each of the Mon
and Tues Recitations.
11/29 Message to Mon 8:40 and 9:40 Recitations:
Due to an error in the key (for which I apologize)
Multiple Choice #4 was graded incorrectly. Please
return your test paper to your TA for correction.
Thank you.
11/24 A copy of the solutions to Test 4 is available
at the Noble Library Copy Center.
11/12 There will be a nighttime help session at 7PM
in PSF-101 on Monday 11/15. No test hints will
be given, no new material will be covered, and
I will not do HW problems. I WILL answer your
questions about concepts that you do not
understand.
EXTRA OFFICE HOURS - Tues 11/16 2:30 - 4:30 PSF-430
11/8 In the HW for Mon Nov 8 (HW assignment #30)
make the following change: Drop problem 14
and add problem 15 (Chapter 32). In the
reading for Chapter 32, add Section 1 through
equation 32-1, and Section 3, stopping at
Hysteresis on page 872.
11/3 In the HW for Wed Nov 3 (HW assignment #28),
make the following change: Drop problem 40
and add problem 44 (Chapter 31).
11/2 A copy of the solutions to Test 3 is available
at the Noble Library Copy Center.
10/22 There will be a nighttime help session at 7PM
in PSF-101 on Monday 10/25. No test hints will
be given, no new material will be covered, and
I will not do HW problems. I WILL answer your
questions about concepts that you do not
understand.
EXTRA OFFICE HOURS - Tues 10/26 1:30 - 3:30 PSF-430
10/19 My usual Friday office hour, this week only,
will be moved to Thursday from 2:30 - 3:30
in PSF-430.
10/11 A copy of the solutions to Test 2 is available
at the Noble Library Copy Center.
10/4 Message to Mon 840 and Mon 940 Recitations:
Dan forgot to record the grades of the HW and
quiz papers that he returned to you today.
Please save those papers and show them to him
next Monday so that your grade can be properly
recorded. Thanks.
10/1 There will be a nighttime help session at 7PM
in PSF-101 on Monday 10/4. No test hints will
be given, no new material will be covered, and
I will not do HW problems. I WILL answer your
questions about concepts that you do not
understand.
EXTRA OFFICE HOURS - Tues 10/5 2:30-5:00 PM
9/21 ANNOUNCEMENT #1
In HW #12 for 9/22 make the following change:
Drop problem 61 and add the following problem:
A thin, spherical, conducting shell of
radius R is mounted on an insulated support
and charged to a potential -V. An electron
is fired from point P a distance r from the
center of the shell with an initial speed v_0,
directed radially inward. What is the value
of v_0 chosen so that the electron will just
reach the shell?
ANNOUNCEMENT #2
My office hour this Friday only (9/24) will be delayed
by one hour. That is, my office hour Fri will be
3:40-4:40 instead of the usual 2:40-3:40.
9/17 A copy of the solutions to Test 1 (Yellow Test)
is available at the Noble Library Copy Center
9/10 There will be a nighttime help session at 7PM
in PSF-101 on Monday 9/13. No test hints will
be given, no new material will be covered, and
I will not do HW problems. I WILL answer your
questions about concepts that you do not
understand.
EXTRA OFFICE HOURS - Tues 9/14 2:30-5:00
9/6 Comments on the neatness and organization of HW.
It is to your advantage to make your HW as
neat as possible. If your TA can follow your
logic clearly, then it is more likely that you
will receive the proper credit for your work on
the 10 point problems.
It is also to your advantage to organize
your HW as clearly and as neatly as possible.
This increases the likelihood that your TA will
find all of the one point problems and be able
to determine that you have made a "good faith
attempt to solve them." Please do not simply
copy down the right answer and then expect to
receive credit for an attempt to solve any
particular problem.
Neatness and good organization is to your
own advantage as well as a point of consideration
for your TA and for your fellow students, whose
papers are being graded at the same time as yours.
Remember that your TA is grading as many as 120
HW papers per week.
Homework that is EXCESSIVELY sloppy and/or
disorganized, to the point of being extremely
difficult or impossible to grade, will not receive
credit, at the disgression of your TA. In such
a case the TA will make a copy of your HW paper,
in case of an appeal to the course instructor.
8/30 Monday recitations miss one meeting because of
the Labor Day holiday. Several people have
asked me about the HW that would have been
turned in on that day. Following the rules
in the syllabus, that HW will be turned in
on Mon Sept 13, along with all other HW assigned
through the previous Wed (Sept 8), but not yet
turned in. To be explicit, on 9/13 the HW due
will be the HW from 8/27, 8/30, 9/1, 9/3, and
9/8. I apologize for not making this clear
in the syllabus.