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Quality answers to common physics questions
T 11:39 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
May6-14 04:32 AM
Cthugha
168 180,130
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 68,282
Hi, I am just wondering is there such thing as perfect crystal. I don't know much about this stuff. It seems to me...
Aug19-09 08:32 AM
DaveC426913
14 5,340
Hey guys. I'm trying to figure out the spring constant of a bungee cord. Weight = 80kg Gravity = 9.8m/s/s Length...
Aug19-09 07:21 AM
the_awesome
4 1,233
A train is travelling at the speed of a bullet. A man, stood on top of the train, fire's a gun in the direction...
Aug19-09 04:05 AM
fatra2
1 1,785
Hi, The way I understand it (and correct me if I'm wrong). Sometimes a star collapses on itself and forms a...
Aug18-09 11:37 PM
sylas
18 2,153
Hi, i've been pondering over the properties of a beam of light and i'm curious if the concentration of photons in eg....
Aug18-09 09:55 PM
Andy Resnick
11 2,660
This question came to me as having an obvious answer yet I dont know. If a human is floating in space they bend...
Aug18-09 09:17 PM
Redbelly98
2 875
This one has also puzzled me for quite some time. How come that glass, water and diamonds for instance are...
Aug18-09 02:09 PM
triac
0 524
Ok, so I've been thinking on this one for quite some time: How is it possible to obtain a characteristic spectrum...
Aug18-09 02:03 PM
triac
0 861
Is this the right format of the energy equation (equation 2.10)? ...
Aug18-09 09:42 AM
MasterD
2 1,082
I was watching this E & M lecture...
Aug18-09 08:07 AM
Born2bwire
1 1,223
Are electricity and magnetism field lines the same? please be detailed!
Aug18-09 08:07 AM
DaleSpam
2 1,061
Does anyone know how to generate the frequency in hertz of a note(middle C, F# ,G etc.) programatically assuming that...
Aug18-09 04:19 AM
DrGreg
5 1,398
one of the laws of friction states that the frictional force is independent of the area of contact,and velocity,how...
Aug18-09 03:22 AM
Shooting Star
14 2,154
Hello, I'm performing some experiments for a research project that involve electrospinning. The basic apparatus is...
Aug18-09 01:21 AM
dredd2929
0 1,749
Hi guys, for an electron to jump from a lower energy to a higher energy state, it must absorb photons that correspond...
Aug18-09 12:17 AM
sylas
1 734
Hi fellow thinkers. I need constuctive criticism on the following:- Imagine a tube circling around into a closed...
Aug17-09 10:51 PM
LeonStanley
9 4,175
Hey guys, I have a short question here. If a resistor and a capacitor are connected in a series, it takes 2 seconds...
Aug17-09 04:38 PM
Dadface
2 972
I need to do some research on the physics of F1, and it can't be too complicated. I've already got centripetal force,...
Aug17-09 01:49 PM
freeman2
8 1,983
I have a question about phenomena of glare. I had read about an article saying that the glare is caused by the...
Aug17-09 02:16 AM
danong
0 637
Hey all. First time posting here. Not that i know worth a damn on physics; i'm just interested. Anyways... What are...
Aug16-09 10:50 PM
mg0stisha
4 6,062
Hi guys. i have a very short question. In an isothermal process, change is temperature is zero, so change in internal...
Aug16-09 09:57 PM
101nancyma
3 5,562
I learned from a website that cathode ray tubes fire electrons from an "electron gun" at the cathode towards the...
Aug16-09 06:59 PM
negitron
1 1,972
Hi, I'm new to the forum, and I'm looking for input. I'm looking for a material that when it comes under pressure or...
Aug16-09 04:49 PM
marcusl
1 1,240
An object at the focal length distance from the lens is imaged at infinity,Do this mean that under this situation, our...
Aug16-09 04:41 PM
Dadface
8 4,594
Ok I have a general question. Say I have a bunch of electrons moving in a line, not in a wire, but I guess it could be...
Aug16-09 04:38 PM
Bob S
2 2,479
Sometime last year, I wrote a textbook on introductory E and M. In one of the chapters, I attempted to solve the...
Aug16-09 01:25 PM
CFDFEAGURU
1 921
When an ambulance approaches, its siren sounds shriller than when I relatively motionless to it, and vice versa. Such...
Aug16-09 10:00 AM
DrGreg
37 4,069
If we were to model the universe can we calculate the gravitational information rate which a particle receives in a...
Aug16-09 08:08 AM
cristo
10 1,051
just wondering if its a sneaky answer or just as simple as put a magnet next to it?
Aug16-09 05:33 AM
fleem
3 2,897
Hi everyone, Am a grad student doing experimental research in an interdisciplinary lab of...
Aug16-09 01:10 AM
savannas
3 1,950
Lately I've been playing around with the idea of creating a very simple flight simulator as a hobby, just to learn the...
Aug15-09 07:58 PM
Cyrus
6 1,735
So, I was playing around with this virtual lab online. I could add light gas or heavy gas to try to make the piston...
Aug15-09 03:31 PM
xxChrisxx
3 3,883
When we clap, we hear a sound..The reason is that on clapping sound waves are produced.... My question here is why???...
Aug15-09 12:01 PM
Naty1
3 989
Hi, I'm trying to understand the rotational energy of a fan impeller. I understand RE = 1/2Iw^2 So therefore...
Aug15-09 11:51 AM
Naty1
1 1,386
Ok so I understand that whether an object floats or sinks depends on its density vs the density of the solution, and...
Aug15-09 01:01 AM
qraal
2 3,334
Alright, According to the law of Conversation of Energy states that, Energy in a system may take on various forms...
Aug15-09 12:39 AM
qraal
4 1,176
Hi, guys, i tried to read the definitions of laminar and turbulent flowon some of the website, but had difficult time...
Aug14-09 07:09 PM
Kurdt
6 3,165
I understand the notion that an electric field admits an electric potential field, giving the energy per unit charge...
Aug14-09 05:55 PM
pgardn
5 1,062
i have asked many lecturers and students this question and have never received a logical sounding answer. Why is it...
Aug14-09 02:03 PM
KGPhysiks
23 2,092
Dear Readers, I am trying to build a Schering bridge to measure capacitance change for my research. I need to...
Aug14-09 01:15 PM
berkeman
2 3,760

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