From: Katherine Morales [mailto:
Sent: Thu 4/30/2009 11:14 AM
To: Tom Carter
Subject: typos

-Static Equilibrium homework
-correct misspelling in "equalibrium" (title)
-brick on cylinders problem: on 1st and 2nd line of problem, where it says " of the two cylinder area related" (area should be "are")
- Periodic motion homework: simple pendulum problem, letter e) "let's to" (change "to" to "go")
- Wave motion homework, Doppler effect/boyfriend problem
-2nd line: change "form" to "from"
- part a, take out "is the"
- part b, take out "is"

From: Katherine Morales [mailto:
Sent: Thu 4/30/2009 4:18 PM
To: Tom Carter
Subject: typos

-Waves assignment

-Wave on a rope problem: help in strategic analysis, after 2nd blue box it says "occilating motor" (change to oscillating)

-Traveling wave problem:

- parts a and b, add "the" between "what is" and "amplitude"

-part c, add "is" between "what" and "the"

From: Matthew Posch [mailto:
Sent: Fri 5/1/2009 8:05 PM
To:
Subject: typo!

mr.carter, this is matt posch from your phys 2111 ,and there is a typo at the bottom of this conceptual analysis, it is underlined and in bold, it should read KNOWN but reads KNOW! thank you!

HELP HELP
The base question asked us to find the y-displacement of the rope at a x1 = 0.5 and t = 0. This cries out for us to use the harmonic wave equation. y(x,t) = A sin (kx - t + )
But, first we have to supply some of the missing information.
First lets look at the wave number k. What basic property of waves does k depend on?

wavelengthOK
Correct! The wave number depends on wavelength. k = 2/
The only reason k exists is to make the math in the harmonic wave equation work out right. If we change the variable x by one wavelength, then the sin(...) term must change by 2
So, we need to calculate the wavelength. What variables does wavelength depend on? There is more than one answer to this question
velocity
frequency
phase
amplitude
OK
Yes! Wavelength depends on velocity and frequency. *f = v
In this problem, the frequency is fixed by the occilating motor. So, the unknown we need to find next is velocity. What information could we use to find the velocity of the wave? There is more than one answer to this question
the mass per unit length of the string
the hanging mass attached to the end of the string
the tension in the string
the amplitude of the wave
the position of the wave crests as a function of time
NO
If the position of the wave crests as a function of time was know, then the problem would be finished. We have to find the velocity, the wavelength, and the wave number before we can use the harmonic wave equation.

From: Matthew Posch [mailto:
Sent: Fri 5/1/2009 10:15 PM
To:
Subject: TYPO

MR CARTER THIS IS MATT POSCH FROM YOUR 2111, I FOUND ANOTHER TYPO!

Tension

Two indentical strings are stretched between the same posts. If the fundamental frequency of the first string is twice that of the second, what is the ratio of tension of the first string to the tension of the second?

F1/F2 =
I BELIEVE IT SHOULD READ 2 IDENTICAL STRINGS, THANK YOU!

From: Katherine Morales [mailto:
Sent: Mon 5/4/2009 8:02 AM
To: Tom Carter
Subject: typo

-gravitation reading assignment: question 3, "for an satellite..." (change an to a)
-textbook, page 125, right side of the picture diagram in example 8.5, "intial state" (initial)

From: Katherine Morales [mailto:
Sent: Mon 5/4/2009 11:32 AM
To: Tom Carter
Subject: typo

Waves homework, wave pulse on a rope problem, help for part g: "tension in the rope (calculated in part a) and the amount by which it is stretched (calculated in part b)" (a and b should be switched to e and f)

From: Syed Q..Saif [mailto:
Sent: Wed 5/6/2009 3:39 PM
To: Carter, Tom
Subject: TYPO< TYPO ,<TYPO

In Exam 3 practice. Links for spring 05 and Fall 04 does not work.
Monday lab.
Class from noon to 12:50pm.
Syed Quadri.

Windows Live™: Keep your life in sync. Check it out.

From: Muhammad Hammad [mailto:
Sent: Wed 5/6/2009 5:44 PM
To: Carter, Tom
Subject: Typo

Gravitation Post-topic problem two (Neutron Star) states:

a) What is must be the minimum mass of the neutron star so that the material on its surface remains in place?

There is no need for the word "is" after what.

-Muhammad Hammad

From: Katherine Morales [mailto:
Sent: Thu 5/7/2009 7:43 AM
To: Tom Carter
Subject: typo

Class webpage, class notes, third exam : "or five problems"

Wave Motion Homework, Sound Music problem, second line: "is fixed is stretched" (take outthe second"is")

Wave motion Homework, Sound Intensity problem, part c: "recieve" (receive)

GravitationHomework, Neutron star problem, part a: (take out"is" between "what" and "must")

Asteriod problem, part b second line: "continues"

part c, second line: "continues"

Force from three spheres problem, first line: "Two spheres

first line: "mass M for an"(change "for" to "form")