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Aug12-14 11:12 PM Simon Bridge 
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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...
Sep5-14 05:07 PM
DennisN
170 192,394
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 71,240
If an electric charge is placed into an electric field of a charge that has been around for a while, it will start to...
Mar19-14 06:37 PM
Vanadium 50
12 431
Hello. I'm looking for the deflections of a 1.938" dia. steel shaft at different lengths. Supported in bearings at...
Mar19-14 03:56 PM
SteamKing
1 349
I) is it physically correct to say that something is hot or cold II) if something is cold do you say that it has a...
Mar19-14 02:47 PM
Chestermiller
4 399
Hi all, I hope this is the right place for this question. What effect does increasing voltage have in an X-ray...
Mar19-14 10:50 AM
sophiecentaur
13 611
I know that a smaller width of a gap would lead to "more diffraction", and diffraction effects are at their peak when...
Mar19-14 03:56 AM
sophiecentaur
18 753
Two Scenarios: 1. I have to push a cart. I apply a constant force of 10 newtons in the horizontal direction. The...
Mar18-14 05:50 PM
Khashishi
11 650
Today, all of the scientific world (including /r/physics) buzzes about BICEP2's discovery of gravitational waves...
Mar18-14 05:43 PM
Khashishi
6 523
Undergrad physics student here, working with fibre optic cables for my final year project, specifically to do with...
Mar18-14 04:36 PM
davenn
1 345
The lens equation is given as M = h'/h = -s'/s It's not explained in the book as to why h' and h are positive and...
Mar18-14 01:55 PM
negation
5 460
If the potential difference between point A and point B is 10 Volts, then when a unit positive charge passes from A to...
Mar18-14 01:06 PM
sophiecentaur
3 443
What is the formula to evaluate Lorentz force on a curved current carrying wire in a non-constant magnetic field...
Mar18-14 12:42 PM
Malverin
4 620
Hello, My question is: how much energy is needed for changing inertia of flywheel? example: on rotary shaft...
Mar18-14 12:21 PM
f95toli
9 741
Imagine two light rays parallel to each other , one of them is traveling in vaccum and the other one in water. We...
Mar18-14 12:14 PM
sophiecentaur
5 408
Greetings, Long time reader, first time poster, so try to go easy on me :redface: I'd love to get a sanity check...
Mar18-14 11:18 AM
ZapperZ
1 439
After searching on the web and reading a bit, I found that lenses can perform Fourier transform. All you need to do is...
Mar18-14 09:56 AM
dauto
4 576
So I've always been confused about this. Suppose you have your normal pendulum: length L, mass m, and angle Θ. When...
Mar18-14 08:25 AM
DaleSpam
9 501
Greetings, While attempting to learn something about cryptography, I have repeatedly encountered a commonly quoted...
Mar18-14 05:54 AM
f95toli
7 610
How 2 find out the energy of a particle in joules, given it's temperature?
Mar18-14 02:35 AM
z.js
9 1,080
Is a helicopter which is stationary relative to the surface on a geostationary orbit? Why, or why not?
Mar17-14 03:57 PM
D H
38 2,007
I was wondering whether you could trap a cation simply by putting it inside a positively charged sphere. Is this...
Mar17-14 03:01 PM
mfb
1 374
I am very sorry because this post seems spammy, but I cannot, for the life of me, find the resistivity of NiCu alloy. ...
Mar17-14 02:35 PM
nasu
3 367
Hi all! Let me use an example to make this clear. There is a car travelling directly toward a man at 10m/s. The car...
Mar17-14 12:17 PM
Malverin
4 440
My background is Mathematics. I'm thinking about learning Physics as a hobby. I know a little Physics from courses and...
Mar17-14 11:24 AM
Nugatory
5 479
Please note this is a very serious thread. Please note Newton's First Law: First law: When viewed in an...
Mar17-14 11:00 AM
DaleSpam
5 697
The law of Conservation of Energy states that in a closed system (the entire universe or the Earth and Moon?) the...
Mar17-14 08:55 AM
DaleSpam
11 755
I work in the IT department for a small mining company and recently discovered during some product research that one...
Mar17-14 08:34 AM
A.T.
1 339
This is a homemade generator I've been trying to make using a hand crank, neodymium magnets and two copper coils. It...
Mar17-14 08:03 AM
nasu
12 623
My 12 year old daughter is conducting an experiment that includes testing various sporting helmets to determine which...
Mar17-14 07:04 AM
sophiecentaur
3 472
Hi I attached the file. there are 3 different types of forces applied. and material's yield strength is 55.1 MPa or...
Mar17-14 07:03 AM
Simon Bridge
1 364
Is the charge distribution of an electron uniform, or is there more charge concentrated near the center or perimeter?
Mar16-14 08:38 PM
edguy99
2 403
Hi all, I'm reading through Zwiebach's String Theory text on my own and am thinking about one of his very elementary...
Mar16-14 06:18 PM
mfb
5 419
500lbs pressing down on two gears. Surface area of contact on one gear is 0.03125 inches squared. I calculated...
Mar16-14 04:43 PM
MrDiedel
0 341
I am an A level physics student. I have a doubt regarding the saturation of op-amps. For a circuit with a dual power...
Mar16-14 02:24 PM
analogdesign
2 366
i heard that when we rub a finger on a nonconducting material 20000v gets generated,we don't get electrocuted because...
Mar16-14 01:27 PM
SteamKing
2 286
I have once read that if a voltmeter is connected across an open switch in a circuit, the emf of the source is shown...
Mar16-14 10:49 AM
Drakkith
6 747
Just a simple question: what happens to an electron beam in a S-G apparatus , does it split up in two...
Mar16-14 08:05 AM
DaleSpam
5 399
If I send a single wave toward a corner won't it bend around the corner? If so, how does the wavelength of that...
Mar16-14 06:25 AM
ranger275
8 627
I am studying the angular moment(s) in an atom of H (1s) in the classical model, can you help me understand some...
Mar16-14 01:12 AM
bobie
2 381
I need to know about optical switch for my optoelectronics course for physics majors. So far I only know its a switch...
Mar15-14 09:47 PM
davenn
5 463
I am reading Dan Brown's book, 'angels and demons'. It said that anti matter is created by accelerating two ultra thin...
Mar15-14 09:03 PM
micromass
12 538

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