
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 
186,558 
Before posting anything, please review the Physics Forums Global Guidelines.
If you are seeking help with a...

Apr2211 05:27 AM
ZapperZ

2 
69,489 
How can velocity uniformity in dynamos and motors be explained?
What's the mechanism of that happening ?
I'm...

T 06:54 PM
ElmorshedyDr

0 
42 
Is there a way by which we can prove that acceleration and gravity are really the same?

T 06:18 PM
A.T.

46 
6,549 
I'm curious which athletes can produce the most work? I watched a decent amount of the CrossFit Games and was...

T 05:58 PM
A.T.

19 
216 
I’ve been interested in finding out how much power in watts a runner can develop.
There are actually two cases...

T 05:09 PM
jimbostank

10 
4,630 
I'm looking for an equation that can give me the the amount an explosions force dissipates based on varied gas...

T 04:29 PM
Matrixmage

2 
64 
I can not establish the mathematical reason why when a wheel of radius r takes a full revolution it moves 2*pi*r. Can...

T 03:15 PM
jackwhirl

6 
115 
When a para magnetic substance is brought near a north pole or a south pole of a bar magnet it
experiences...

T 12:26 PM
WannabeNewton

1 
75 
Im not quite sure what it is about this simple concept that i cant get, but im having a very tough time understanding...

T 10:51 AM
olivermsun

2 
120 
Hi. I have a door mounted on 2 hinges, aligned on a vertical axis. The hinge shafts run in flanged plain bushes.
...

T 09:52 AM
ghobbs

3 
139 
When you compute the average potential energy of a horizontal spring mass system from the mean position to the...

T 08:30 AM
olivermsun

25 
351 
Can we make curvy vectors? Or to put it another way: Instead of one straight direction, can the direction be round(or...

T 08:11 AM
irishhockey

2 
147 
Hi Everyone,
So I think this is a bit of a loaded question, but how do professional physicists find/learn the most...

T 08:07 AM
irishhockey

4 
228 
Lets consider an ideal transformer in noload state, i.e. with the primary side connected to a voltage source, and the...

T 04:52 AM
sophiecentaur

25 
1,321 
Hi all, I'm not a Physicist, but, I had an idea I wanted to put to bed. If you drop a weight on a rope that turns a...

T 04:49 AM
sophiecentaur

10 
292 
When 2 unequal vertical forces act on the 2 ends of a vertical rope, how do I calculate the tension at the midpoint?...

T 01:21 AM
tasnim rahman

1 
131 
Hey,
Just doing some reading on this and I'm a little confused as to why absorption produces a progressive...

T 01:13 AM
davenn

4 
132 
I want to know the derivation of solid angle.
I have found on net. But the derivation is to long, is there any...

T 12:58 AM
Hardik Batra

2 
151 
Hi,
I am trying to redesign a system thats already avialable. It contains a small metal rod hanging in mid air...

T 12:15 AM
kvkskumar

0 
101 
Hi PF, please could someone help explain how the bandwidth of a telephone line works. I have read that fibre optics...

Y 08:58 PM
256bits

8 
196 
I'm coming here from going through the Dirac delta potential in QM to clear my mind about the case when E < 0, which...

Y 05:40 PM
Gebri Mishtaku

6 
304 
Does hooks law apply to a bent hockey stick. How does one measure the potential energy? Do I start by clamping one end...

Y 05:09 PM
256bits

3 
164 
What is the energy partition in the laserinduced plasma? Based on the atomic emission spectra from the plasma, we can...

Y 03:47 PM
mfb

1 
128 
Hello,
I'm working on a project to absorb sound energy and I'd like to ask for hints, or methods, of calculating...

Y 03:30 PM
H2Bro

9 
748 
So I play the guitar, and I cannot use the same amp I use to gig with, because in my home basement, it's too sharp and...

Y 03:24 PM
enorbet

10 
252 
I have a question that has been puzzling me. If a beam of light was released within a sphere or cube with a completely...

Y 02:39 PM
mfb

4 
198 
.
Why do we need 12 Units of Energy?
When the SI Unit of Energy Joule should be the universal standard.

Y 02:36 PM
mfb

18 
356 
Since E=mc2, that means that mass is energy and energy is mass right?

Y 02:26 PM
Nugatory

20 
594 
Isn't the above two statements contrary?
From Feynman's quote, the atoms must be wiggling even at absolute...

Y 12:31 PM
Meson080

8 
466 
Why is cream on the top being so much more dense than milk below?

Y 11:18 AM
Nugatory

4 
430 
White light is composed of 7 wavelengths. And yet we show white light as one single electrical wave perpendicular to...

Y 09:40 AM
voko

1 
140 
Hi,
I'm struggling to understand why we never consider normals when doing torque questions?
One on the top of my...

Y 09:18 AM
Jd0g33

2 
163 
Copper conducts electricity and so does other metals like silver. Now a new material is coming to play which is...

Y 07:42 AM
sophiecentaur

4 
192 
Agreed. The misunderstanding comes from the ambiguity of the word "pushing". I interpreted it as "applying a force",...

Y 07:05 AM
gianeshwar

36 
689 

 
 
 
I recently learned about faraday's law about electromagnetic induction , where you move a piece of magnetic towards...

Jul2914 09:31 PM
Vanadium 50

23 
476 
Just had a dream about someone that bowled a cricket ball (spin delivery) and after it bounced when it got to about a...

Jul2914 07:34 PM
lufc88

2 
162 
Mylar is an insulator, but it is coated with metal. Intuitively it should be possible to wrap a laptop in mylar and...

Jul2914 06:46 PM
Drakkith

2 
453 
Hello guys, i'm new in this forum, this is my first Thread.
I've started reading Robert Geroch's Mathematical...

Jul2914 06:34 PM
impblack

0 
154 
Hi all,
I've been toying with an idea lately and I'm wondering if any of you could help me out. Is there any method...

Jul2914 06:07 PM
mfb

1 
145 
why exactly does light bend in a medium??

Jul2914 03:34 PM
jtbell

8 
214 