
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...

May614 04:32 AM
Cthugha

168 
176,997 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Apr2211 05:27 AM
ZapperZ

2 
67,742 
I have a general question. Is an increase in potential energy always associated with the decrease of the speed...

Mar2613 11:45 AM
mfb

1 
432 
It is generally well known that the elastic modulus of most materials become larger with decreasing size. This could...

Mar2613 09:07 AM
CWatters

1 
690 
Hello,
I was reading the article given in this link http://www2.ignatius.edu/faculty/decarlo/kirchhoff.htm, of...

Mar2613 03:28 AM
sophiecentaur

38 
2,754 
Hey guys,
I'm not sure how to interpret euler's fluid equations
\rho (\partial / \partial t + {\bf U} \cdot ∇)...

Mar2613 02:16 AM
tinytim

1 
469 
Hi, I'm trying to come up with some examples of ODEs (not PDES) in physics that are unsolvable analytically, and for...

Mar2613 12:27 AM
SteamKing

1 
619 
Robert Braeunig has an great blog on rocket science here: http://www.braeunig.us/space/index.htm, and I've been trying...

Mar2513 11:01 PM
Simon Bridge

3 
495 
I have a problem involving the rotational version of Newton's Second Law. A spool is resting on a tabletop. A wire is...

Mar2513 06:47 PM
rcgldr

2 
739 
Hi, I am a Norwegian student and have a practical question. I am sorry about my English. My iPad keeps autocorrecting...

Mar2513 11:55 AM
mfb

8 
966 
If two capacitors are connected in parallel to a battery and then the battery is removed, what happens to the charge...

Mar2513 11:08 AM
collectedsoul

20 
1,169 
http://upload.wikimedia.org/math/0/f/3/0f36df929ac9d711a8ba8c5658c3bfee.png
I don't really understand this formula...

Mar2513 08:12 AM
Lsos

7 
644 
For a magnetic fields lab I am asked to graph the data and from there, use the slope to find a certain value.
For...

Mar2513 04:26 AM
mfb

7 
3,816 
Hello ! I'm going to use thin ( 0.004" ) sheet of Permalloy80 to realize a magnetic shield ( against european 50 Hz...

Mar2513 02:22 AM
Ravaner

3 
599 
I've been teaching myself some thermodynamics, and I've been thinking about solving the heat equation.
...

Mar2413 08:55 PM
Chestermiller

3 
727 
Lasers are known to emit a particular wavelength, and with a bandwith that is extremely narrow. I have been told that...

Mar2413 08:50 PM
marcusl

4 
649 
Everything radiates. Then when we accelerate an electron (in the experiment of diffraction of electron to prove...

Mar2413 06:17 PM
Outrageous

16 
1,232 
Hi,
First of all, I am an undergraduate Chemistry student, but who is also very interested in various areas of...

Mar2413 04:35 PM
Chestermiller

2 
870 
Does the spring constant of a piece of rubber affect its rate of cooling constant 'k' ?
1) Is there any formula,...

Mar2413 03:38 PM
AlephZero

4 
572 
I have a question about coherent light in antiphase, I'm probably thinking about this wrong but I just cant...

Mar2413 01:27 PM
sophiecentaur

10 
879 
Hi All,
I need help determining focal length value in a two lens system. In the set up, the light source (object)...

Mar2413 01:18 PM
Andy Resnick

1 
524 
I am calculating the time it takes for an object to fall 90° about an axis of rotation in the xy plane. I have...

Mar2413 09:47 AM
mfb

7 
879 
I am in my senior year of school and I have been given a research task to do on the Earth's magnetic field in a given...

Mar2413 08:21 AM
BobG

11 
1,609 
Hi,
I am trying to derive the compton effect formula.
I am not very good at physics, however, I am trying to get...

Mar2413 07:49 AM
ZapperZ

5 
821 
Hi there everyone,
Would like some checking of my work or comments.
Would like the work done on a falling mass M...

Mar2413 05:54 AM
sophiecentaur

11 
1,126 
Dont give me the answer that its because of surface tension. I want it in detail.

Mar2413 05:46 AM
sophiecentaur

7 
859 
The title pretty much says it all, but let me elaborate on the source of confusion. VIM defines quantity as:
...

Mar2313 09:27 PM
DaleSpam

7 
624 
This problem is making me want to tear my hair off.
I am trying to calculate the time it takes for a beam to fall to...

Mar2313 07:33 PM
Ryoko

2 
908 
why the pulse is positively chirped pulse in picture 20130320182307.png ? thank you!!
I also confused by another...

Mar2313 06:07 PM
dmriser

8 
1,166 
in what situations would you require the use of the parallel axis theorem?
Also, from the physics book it says that...

Mar2313 03:42 PM
HSScientist

1 
582 
The angular speed of precession for a gyroscope is given by ω_{p} = T/ω_{g}.
So that the rate of precession...

Mar2313 09:50 AM
pumila

6 
1,139 
I am an electrical engineer disabled in a snow sking accident and am now a quadriplegic. I'd like to design an...

Mar2313 09:30 AM
mfb

9 
1,078 
When a magnet has a value of.. lets say 10 Tesla, what does this mean exactly? Does this mean the magnetic field value...

Mar2313 09:15 AM
mfb

6 
747 
Is it possible to use the stressstrain diagram from a stress test, to determine at which point an object would be...

Mar2313 09:08 AM
risecolt

0 
624 
In our formulation of work done by a Force we say it is ∫ F.dl ... My knowledge of integration means adding...

Mar2313 08:33 AM
Doc Al

6 
510 
hello ,
I am trying to detect a laser pulse with a photodiode , having a power of 100w max of the laser beam with...

Mar2313 08:27 AM
Redbelly98

15 
1,525 
The question is quite simple where in the universe I would be completely at rest. Not moving at all. I ask the...

Mar2213 08:57 PM
carlgrace

5 
735 
Can someone tell me how a moving coil meter is converted into an ohmmeter?
I have been searching for relevant...

Mar2213 06:59 PM
Bobbywhy

1 
613 
I cannot figure out focal distance and the like, is there anyway I can get a walkthrough?
the radius of curvature (R)...

Mar2213 06:46 PM
tinytim

1 
441 
For example if a hat is lined with nickel,
silver, EMF paint, etc. , then how do you
ensure the hat is grounded? I...

Mar2213 06:26 PM
Drakkith

9 
1,787 
In some questions I am doing, you set of a pair of simultaneous equations and in the notes we have that . For a non...

Mar2213 03:32 PM
t100ss

2 
441 
I read in Feynman's book that it is not possible to see objects less that wavelength of visible light with a...

Mar2213 01:37 PM
Emilyjoint

5 
2,089 