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Quality answers to common physics questions
Y 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
168 180,349
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 68,332
Does anyone know a good website where there are practice questions for complex circuits. I'm preparing for an exam,...
Jan18-14 07:47 PM
NewtonsHead
1 322
I'm taking my first semester of calculus based physics next week. How much trig should I know? I know the basics and...
Jan18-14 03:04 PM
tolove
5 462
What is a good way to memorize that ## \omega = \sqrt{\dfrac{k}{m}} ## ? I always confuse it with: ## T = 2\pi...
Jan18-14 02:40 PM
sophiecentaur
5 453
Can you please tell me whether I am right or wrong? Lagrangians are scalars. They are NOT invariant under...
Jan18-14 01:26 PM
shounakbhatta
0 204
I am reading the book "The Evolution of Physics". I have a doubt in the topic "The field as representation". In this...
Jan18-14 01:05 PM
sophiecentaur
3 305
When I had a school tour to A water park, there I observed that when a heavy boy used to slide down a water slide(and...
Jan18-14 12:46 PM
sophiecentaur
4 377
I don't understand why as temperature increases, the hall voltage goes down. What's going on with the electrons at...
Jan18-14 10:47 AM
leroyjenkens
2 325
So I have a series of 5 data points lets say that they are (1,1),(2,3),(3,4),(4,4.5),(5,4.75) that create a power...
Jan17-14 10:10 PM
Simon Bridge
1 334
Rather than try to explain what I am talking about, I am going to link to an image of it below. My question is in...
Jan17-14 09:40 PM
Ascendant78
2 322
I'm trying to get a feel for the overall magnitude of the Earth's magnetic field. If I placed a superconducting...
Jan17-14 08:19 PM
.Scott
2 400
I am very confused about the fact that, for example, Pluto moves around the Sun much slower then Earth and is also...
Jan17-14 04:45 PM
sophiecentaur
14 668
OK... So I was sitting there minding my own business when my alter ego popped out of no where and started asking me...
Jan17-14 03:56 PM
Khashishi
17 563
Hello I am trying to get into physics and astronomy as a hobby so please excuse the crudity of my posts, I...
Jan17-14 03:43 PM
phinds
8 539
I am not a physics professional. I just have found a casual interest in physics. I have a question about gravity. ...
Jan17-14 03:10 PM
inertiaforce
7 526
Hi, I'm doing a group investigation on external wall insulation for my school building. The walls do not have a...
Jan17-14 02:10 PM
Chestermiller
4 462
suppose that you went to moon.You have nothing else with you except a discharged battery.now if I have to recharge it...
Jan17-14 01:27 PM
.Scott
10 536
Hello all, I've been trying to come up with an optical design to basically form images onto a sheet positioned near...
Jan17-14 09:53 AM
Andy Resnick
1 387
At this page http://amasci.com/elect/vwatt1.html it says: VOLTS x COULOMBS = JOULES It takes energy to push...
Jan17-14 09:03 AM
ZapperZ
63 1,612
Dear all, I would like to ask: Given a control volume (V1), at an initial temperature (T1), the pressure (P1) in...
Jan16-14 11:26 PM
Andrew Mason
11 675
Hi everyone, here's the situation: Everyone knows that you can simulate artificial gravity by rotating a space ship....
Jan16-14 08:43 PM
kurros
5 432
We all know that there four fundamental forces in nature, viz. The gravitational force The electromagnetic force...
Jan16-14 06:32 PM
kurros
12 923
I have a quick question about simple harmonic motion. My text states this in the picture attached, and I'm confused as...
Jan16-14 05:31 PM
xtrubambinoxpr
2 310
Hi, So recently I read about the massive 3 gorges dam changing the mass moment of inertia of the Earth to such an...
Jan16-14 01:05 PM
BruceW
3 511
Hi, As part of an experiment I am doing I have a small uniform circular disc that is submerged in 20ml of a liquid...
Jan16-14 10:55 AM
deadstar33
7 515
Hey guys. It's been awhile I don't posting in this thread. How could space which is nothing, is finite yet...
Jan16-14 09:04 AM
ZapperZ
15 684
I always see those spring mass type questions on AP M.C. questions. Ones with a horizontal spring connected to a...
Jan15-14 08:36 PM
Chestermiller
2 375
For my question let us just consider two telephone (POTS) connected by wire, junction boxes, several telephone...
Jan15-14 08:08 PM
Drakkith
7 535
If different frequencies of light have different refractive indices for the same material and travel at different...
Jan15-14 03:36 PM
sophiecentaur
3 368
Hello, Sometime in the last 6 months I read that researchers analyzing data from the decay of a subatomic particle...
Jan15-14 01:52 PM
Vanadium 50
3 324
I am a young physics student currently attaining my A Levels, therefore my knowledge of this higher quantum physics is...
Jan15-14 08:02 AM
ZapperZ
1 479
As I understand it; when an explosive material is set off, the force is dependent on the Amount and the said Material....
Jan15-14 12:43 AM
elegysix
8 515
Is the electric force on a charged particle always in the same direction of the field? What if it is an uncharged...
Jan15-14 12:12 AM
berkeman
8 631
If you have a container that contains pressurized gas such as hydrogen, the hydrogen would be pressing against the...
Jan15-14 12:01 AM
berkeman
3 435
Given an example of a rifle bullet traveling east or west, why does the bullet deviates HORIZONTALLY? (right on the...
Jan14-14 10:07 PM
jartsa
10 913
As I understand it, pulleys will reduce the force needed to lift objects but require a greater distance. As the number...
Jan14-14 08:17 PM
Nugatory
6 615
I'm currently a first year physics student and missed some nets and concepts and need help before exams. It would be a...
Jan14-14 07:47 PM
Simon Bridge
6 540
Can we see atoms or other atomic stuff like electrons and protons, etc.? If not, how can we know they exist and how...
Jan14-14 06:15 PM
SF49erfan
23 2,785
I understand that generally, power and light bulb brightness are directly proportional. However, because there are so...
Jan14-14 04:23 PM
justadream
14 800
Their are three proven dimensions ( + time ) and we can only see two right? Google insists their could be more or even...
Jan14-14 04:22 PM
mfb
19 1,008
does anyone know where i can find the information on how to build the particle analyzer for the particle accelerators?
Jan14-14 01:56 PM
ZapperZ
2 438

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