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

Sep514 05:07 PM
DennisN

170 
192,436 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Apr2211 05:27 AM
ZapperZ

2 
71,259 
Has anyone seen this form of a nonlinear equation with respect to X, but linear with respect to Y & Z? I provided a...

Nov2412 07:09 PM
tsunamiBTP

0 
673 
hi everyone! i'm very confused about inertia matrix... i searched all over the web but didn't find a concise...

Nov2412 06:33 PM
SteamKing

1 
560 
Lets say I have a superconducting pipe that is infinitely long.
Now I place a magnet in the pipe, will the magnet...

Nov2412 04:59 PM
cragar

2 
669 
Sorry to be so ignorant!
I have heard that light is a type of electromagnetic radiation but I was also under the...

Nov2412 11:59 AM
AbsoluteZer0

7 
869 
I am a physics teacher and am wondering something about the range equation. Wouldn't that equation work for...

Nov2412 11:04 AM
K^2

5 
1,152 
In a class at OCW 8.01 Professor Walter Lewin said...
"...there are very prestigious physicists who even nowadays...

Nov2412 09:42 AM
micromass

2 
648 
Does Snell's law apply in refraction when the light ray is along the normal line? Utilizing snell's law, the index of...

Nov2412 07:40 AM
sophiecentaur

2 
670 
Hai,
I am doing my masters degree in physics. can somebody help me in which formula to use for calculating...

Nov2412 01:55 AM
brk

7 
1,357 
If you lie on the ground at night with no cover, you get cold rather quickly. Much of this is due to energy loss by...

Nov2312 07:24 PM
K^2

1 
1,867 
My friend bought a new chair for the living room. He says I sit in it with too much force and claims I basically free...

Nov2312 06:56 PM
cosmic dust

2 
656 
I just read a couple articles on angular momentum and spin... So what is the difference between the spin of a planet...

Nov2312 05:01 PM
AbsoluteZer0

3 
842 
An electromagnetic plane wave has an electric field and a magnetic field. Each component contributes equally to the...

Nov2312 04:49 PM
Enthalpy

4 
1,012 
I have a problem with physics when it comes to relating new ideas with new formulas. Like right now I'm learning about...

Nov2312 12:52 PM
mathsciguy

1 
713 
A 0.8 kg ball is whirled on a string r = 0.4 meters long in a vertical circular path. At the bottom of the circle, the...

Nov2312 12:44 PM
HumorMe81

2 
678 
Hi
I'm trying to throw together a concept design for a swing set which can convert kinetic energy into mechanical...

Nov2312 11:19 AM
mikej4823

6 
735 
Why is it the difference in gravitational potential energy is given by U grav 1  U grav 2 whereas for the same...

Nov2312 10:18 AM
jtbell

8 
745 
Is power a quantity defined by:
\frac{dU}{dt} and \frac{dW}{dt}
Is it just defined to be it, or can it be derived in...

Nov2312 09:23 AM
nasu

8 
938 
Hi guys, I got a question in the solid state physics book writen by ashcroft and mermin. This question is about the...

Nov2312 08:36 AM
nasu

9 
1,081 
Can anyone please clarify me a questions that I am unable to find an answer or understand in broader perspective:
...

Nov2312 06:41 AM
K^2

6 
753 
Hello physicists,
I am taking calcbased physics next semester, but I have a really bad background in high school...

Nov2312 03:28 AM
K^2

1 
657 
Because obviously too much density gives terrible sound quality, like in water. So is the answer simply the density of...

Nov2312 02:53 AM
CWatters

6 
868 
Ok so I have got the right answer to my calculation however I do not understand part of it,
here is the...

Nov2212 06:31 PM
Simon Bridge

8 
1,214 
En and Ec are the nonconservative and conservative electric field respectively.
I've quoted this from the textbook...

Nov2212 02:11 PM
Enthalpy

4 
817 
Hello,
What would be the best method to "collimate" light from a LED with an emitting area of 12mm^2 and a maximum...

Nov2212 02:05 PM
Enthalpy

7 
1,906 
Hey all,
just wondering over a very naive question but I couldn't really find the answer by looking through the...

Nov2212 01:50 PM
Simon Bridge

1 
1,304 
I was thinking about refraction of waves and I´m a little unsure. I wanted to run my understanding through you guys to...

Nov2212 08:54 AM
sophiecentaur

9 
1,311 
It is known that Gauss's law for magnetism is ∇ ⋅ B = 0.
If we write this in component form it becomes (∂Bx/∂x)i +...

Nov2212 05:30 AM
Dyon

3 
840 
Hi all,
I was wondering whether someone might help further understand the following equation for current. I mean...

Nov2112 07:49 PM
Ratch

5 
1,771 
Hi,
I am a biologist and I do a lot of experiments on cellular electrophysiology. I keep my preamplifier and the...

Nov2112 05:36 PM
marcusl

9 
974 
I've read the forum rules where it says that graphical/violent content cannot be posted on the forum and I completely...

Nov2112 04:09 PM
Buckleymanor

6 
1,028 
First of all am I right in thinking that ( comparitivly ) low orbits such as the ISS need very high velocities (in...

Nov2112 01:51 PM
K^2

10 
1,069 
Hello there ,
could you please explain to me what would happen to an inviscid/viscous incompressible flow...

Nov2112 12:51 PM
DabaDuBa

2 
595 
What makes, for example, blue color appear darker or lighter? Is it just amount of photons (intensity) or is there any...

Nov2112 11:06 AM
sophiecentaur

111 
9,439 
Hi there
I have a practical physics question. I'm an industrial abseiler, and on the course today we had this...

Nov2112 09:06 AM
Studiot

22 
1,763 
why does the monopoles not exist

Nov2112 09:04 AM
jtbell

23 
2,287 
How do we say(or prove) that when two bodies are moving together , they can be considered as one system?
Suppose we...

Nov2112 08:13 AM
HallsofIvy

7 
1,341 
Strange title? Basically, a few days ago we got a dead rat in our ceiling, which is covered in insulation. Took a...

Nov2112 08:06 AM
mfb

4 
880 
I am exploring what electricity can do and I have a question.
First, can I use ionized gas to make an electric arc at...

Nov2112 05:07 AM
davenn

4 
924 
the linear constitutive equation describes piezo behavior. See wiki. But I can find an example in which linear...

Nov2112 01:55 AM
athosanian

0 
536 
Let's assume that we have a non insulated glass container where there is any gas inside.
If the beginning pressure...

Nov2012 11:42 PM
haruspex

3 
882 