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Quality answers to common physics questions
Y 10:49 PM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 68,137
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
168 179,312
Hi Everyone, I am currently researching some corrosion pits that are growing in a spiral fashion. Can anyone...
Apr9-14 05:27 AM
streeters
0 244
Hello, Wikipedia states: Phase changes, such as melting or evaporation, are also isothermal processes. I am...
Jun1-14 03:29 PM
Chestermiller
2 244
I don't know how to integrate the Maxwell-Boltzmann distribution without approximation or help from Maple. Given...
Jun10-14 07:05 AM
TeslaPow
2 244
Hello , I have a rather odd question. I am trying to find a phenomenon that occurs in nozzles but am quite unable...
Feb19-14 03:38 PM
ajd12
0 245
Hi, I was wondering if there was an equation for the flow rate through a straight vertical or angled capillary...
Jun4-14 11:33 AM
Andy Resnick
2 245
do negative charges in electric fields of positive charges have negative electrostatic potential energy? am I write in...
Mar1-14 05:48 PM
dauto
1 246
As we know there is no charge inside the conductor.(Consider the solid conductor......) All the charge will...
Jun3-14 03:39 PM
nasu
1 247
So if an EM waves travels from one medium to the other, it refracts depending on Snell's law. But what happens when...
Apr3-14 12:24 AM
UltrafastPED
1 247
Say we have two separated observers which have a velocity relative to each other and are both looking at a system. By...
May16-14 08:03 PM
mfb
1 247
Hello everyone I am reading a lot about Stimulated Brillouin and Raman scattering I read the following difference...
Jan23-14 07:50 AM
eahaidar
0 248
What is the highest efficient solar cells out there? I heard there was one that is 80% efficient. And there is a clear...
May12-14 11:41 PM
Bobbywhy
1 249
Graduated College over thirty years ago. In physics, I recall a a question where one is required to weigh an object...
May15-14 08:58 AM
NascentOxygen
1 249
Can someone maybe explain me(or has a good link to a page where this is explained) why scattering in perpendicular...
May20-14 10:09 AM
jennyjones
0 249
https://www.youtube.com/watch?v=f8S0PeOvHAA I have a number of questions about the above video: What are they...
Jun15-14 10:25 PM
Simon Bridge
1 249
Why is it not possible to use multiple detectors in a Bainbridge Mass spectrometer,so that we can record the intensity...
May19-14 04:49 AM
Hummel
0 250
Can anyone speak on the spectrum of sunlight reaching the upper atmosphere and the surface ? Specifically I interested...
Jun2-14 02:42 PM
UltrafastPED
4 251
Why should we bother about Extensive properties in Thermodynamic systems? and Why do we need specific value of some...
Jun10-14 01:20 PM
DrClaude
1 251
I'm trying to calculate the extinction coefficient of air at 275 nm wavelength. Can someone help me do this? I can't...
Jun13-14 07:20 PM
Khashishi
1 251
Let's say a student does a simple experiment where she conducts 10 trials at each x value (at each value of the...
Jul22-14 12:15 PM
highschoolphys
10 251
Hi all, I am trying to understand about collision frequency that happened in ionosphere layer. In D region, below...
Jan29-14 01:33 AM
s_hy
0 252
A current flow occurs when there is movement of electron in a conductor. But in a electrolyte its the ions that move...
May15-14 05:31 PM
sophiecentaur
1 252
Hi, I'd really like to understand How a torsion balance works and exactly how You can use math to derive the Coulombs...
May16-14 11:29 AM
jtbell
1 252
An electromagnet pulls a ferromagnet from a distance(r), now there is a change in flux. The total magnetic field in...
Feb24-14 12:39 AM
Dash-IQ
0 253
While using the potentiometer to measure the emf of an unknown battery the slider is adjusted so that the reading in...
Apr8-14 02:38 AM
Bobbywhy
1 253
When we place a voltmeter across a single battery which is connected to another battery in series, does voltmeter show...
Apr9-14 02:49 AM
Simon Bridge
1 253
Can someone please explain what the parallel axis theorem is?
May30-14 06:33 PM
sophiecentaur
2 253
Angular momentum L is defined by summation of mrxv about a certain point. For a rigid body that rotate about an axis...
Jun15-14 09:30 AM
mattt
4 253
VTh= sqrt where M is the molar mass How do we determine which R constant to use?
May6-14 01:52 PM
dauto
4 254
I have heard of various metals and other materials turning from solid to liquid or plasma when temperature and...
Jun13-14 11:42 AM
Nugatory
1 254
Hi Is the drag coefficient for a particular object the same in different mediums? Say we have Cd = 1 in air for one...
Jan22-14 10:58 AM
cjl
3 255
Hello, I'm having a hard time understanding why diffraction grating spots are narrower than those produced by a...
May11-14 12:51 AM
UltrafastPED
3 255
Hello, I am having to find the rotational diffusion of a magnetic particle inside of water. I already have a diffusion...
Jun15-14 07:05 AM
Jano L.
1 255
Is a wall rigid body or a non-rigid body? As per definition, a rigid body does not change any inter-molecular space on...
Jun24-14 09:32 PM
D H
1 255
Suppose we have the Young's experiment with a convergent lens between the slits and the screen. How would the...
Apr20-14 12:34 AM
UltrafastPED
1 256
Hi, I'm new to this forum, and I need some help with this. I want to determine the polarization of a laser beam, that...
Jun19-14 11:19 AM
UltrafastPED
1 256
Hey I want to build a pneumatic arm that can throw stuff around (see attachment image). Before actually ordering...
Feb23-14 07:02 AM
MadaraUchiha
4 258
When having a circular acceleration motion, we have both tangential acceleration and centripetal acceleration. The...
May23-14 09:39 PM
namanjain
3 258
I am beginner in image processing and want to do filtering in Frequency domain. I can understand that the...
Jun12-14 06:33 AM
UltrafastPED
1 259
Hello guys! Please can someone answer my dilema. Lets say we have two apples on tree. Apple A and apple B. And...
Jun18-14 10:35 AM
cowgomoo
5 259
I was in my physics of the human body class and we got on the topic of pistons. It was given to me that the dampening...
Feb24-14 02:20 AM
256bits
1 260

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