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Quality answers to common physics questions
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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
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Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 70,519
Hey all, I starting to study QED along with a slew with other materials. (I read in the QED book and when I don't...
May29-13 05:03 PM
IxRxPhysicist
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Well, I've been searching for answers for probably the last hour now, and have found nothing but info on cigarettes......
May29-13 05:02 PM
mfb
10 1,309
I've read that it's several times stronger than steel. I haven't read anything about its stabbing resistance against...
May29-13 04:49 PM
sophiecentaur
10 2,349
So yes, the atmosphere exerts a force of 100,000 newtons per square meter. A person's head, is obviously much less...
May29-13 02:36 PM
Daggs
30 49,736
If one knew the equations for the 5 fundamental forces, would that not explain the entirety of all physical phenomenon...
May29-13 01:10 PM
AlexVGheo
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What are the conditions used,While calculating time period of a simple pendulum??
May29-13 12:20 PM
berkeman
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I think i have looked at like 20-30 web pages, and i cant find a simple step-by-step explanation of the operational...
May29-13 12:10 PM
TheFerruccio
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If a magnet could somehow oscillate in and out of a coil of wire and used to power a light bulb, could that power the...
May29-13 12:17 AM
sudu.ghonge
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I have two streams at controlled flow rates that will mix via an inline static mixer. Both streams will have check...
May28-13 09:27 PM
mrmiller1
2 587
I'm having a debate with a good friend and we haven't come to agreed yet. I'm very sure, yes, we will jump higher....
May28-13 08:04 PM
Danger
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gravitational force act in pairs, and they act toward the center of the earth. does it mean that if u find yourself at...
May28-13 06:40 PM
TheFerruccio
9 1,053
I'll go right to the point. I'm trying to get someone interested in physics (and relieve physics of adjectives like...
May28-13 05:14 PM
davenn
3 719
What's the optical phenomenon called when a wheel is rotating clockwise so fast that it eventually looks like it's...
May28-13 11:42 AM
Bandersnatch
1 542
hello all ! my teacher told me to do a research on examples of problems that has connection with green function on...
May28-13 09:07 AM
NegativeDept
4 808
I am starting my 3rd year in September and I've decided to start thinking about research topics early. I'm quite...
May28-13 03:22 AM
Bobbywhy
4 894
Hi everyone I'd like to know what will happen to the magnetization and susceptibility of a given soil sample when it...
May28-13 02:41 AM
SteamKing
2 597
Hello. My first post here. I'm having trouble with the basics of rigid body rotation. I have a few questions (my...
May28-13 02:04 AM
transparent
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Hi, I've been a lurker here for a while but I finally have a question. I was wondering if there is a simple formula to...
May28-13 01:03 AM
iinnovations
9 24,493
I was working on an image processing project a while ago and was specifically working with raster images in the...
May28-13 12:23 AM
sudu.ghonge
10 806
How can I show that the RC circuit has dimensions of time? 1 second = 1ohm x 1farad?
May28-13 12:15 AM
technician
4 808
How is it that the numbers we get for our equations describe the laws of physics so cleanly? As a good example, take...
May27-13 09:07 PM
Vanadium 50
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I Still don't understand why the group velocity has to be less than c but phase velocity not. Can you explain me...
May27-13 08:55 PM
morrobay
4 1,071
How can I show that 1 volt = 1 weber / second?
May27-13 02:56 PM
technician
2 767
now even though I searched the forums for keywords and came up with none exactly matching my case excuse me if this...
May27-13 11:17 AM
the_wolfman
6 948
Hi PF. I'm currently developing a 2D platform game that is significantly physics-based using the Box2D physics...
May27-13 10:29 AM
CWatters
1 629
I read that Infra red waves that are absorbed are emitted by objects. And that makes sense. But then I read that...
May27-13 10:13 AM
CWatters
3 735
I know the fenomenon of diffraction (one slit) in case of electromagnetic waves....
May27-13 09:25 AM
physwizard
17 1,578
Hello I am new to physics and I did no knew were else I can ask this question so i am sorry if I am in the wrong...
May27-13 08:23 AM
Discor
3 650
If anyone can help it will be greatly appreciated. Im trying to figure out what type of pressure valves to use in...
May26-13 10:12 PM
Simon Bridge
3 802
Some guy is trying to tell me that energy does not cause motion, motion is just a brute fact. Here is a quote from...
May26-13 04:57 PM
joebro8659
4 914
Hi, I'm wondering if anybody could explain me the difference between these two concepts with a clear definition for...
May26-13 04:35 PM
chemistry1
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Describe a system demonstrates the validity of Nernst equation to explain and calculate the resting potential? I...
May26-13 02:40 PM
abanoub
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Hello, is there anyone who can help me with this? Im completely stumped. Here is the situation: Point A: Water is...
May26-13 11:33 AM
Aero_UoP
4 851
To what extent do phase space trajectories describe a system? I often see classical systems being identified with...
May26-13 08:33 AM
LastOneStanding
3 643
I don't understand this: According to what modern physicists believe to be true, there is entropy that slowly...
May25-13 11:27 PM
Simon Bridge
3 925
Decay Constant, as it says on my revision sheet is defined as 'The probability of a nucleus decaying per unit time'. ...
May25-13 12:19 PM
jbriggs444
19 1,228
Hello fellow physicists :) I have the following question: take a beam of light traveling in some direction x,...
May25-13 09:44 AM
bouscher
12 1,049
I'm going to be working on a research project for an internship that involves photo-generated carrier dynamics, and...
May25-13 08:33 AM
Wreak_Peace
1 551
Hi, I'm new to physics and have some trouble understanding the concept of Kinetic Energy. It's not that I don't...
May25-13 07:31 AM
Naty1
7 1,050
sorry if this is the wrong place. Does anyone know a supplier for a Fresnel biprism with apex angle approx 168...
May25-13 02:50 AM
Bobbywhy
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