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Quality answers to common physics questions
Jul24-14 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
168 186,358
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 69,429
We are constructing a dip coater in our laboratory. But because of the disparity between the lowest and highest speed...
Jan24-14 06:28 AM
Drakkith
1 241
Imagine a square prism made from some material with such an index of refraction and surrounded by a substance of such...
Jan24-14 06:22 AM
Claude Bile
4 295
Hello everyone I am stuck with a problem about voltages (electrostatic potential) and forces. According to...
Jan24-14 03:47 AM
Drakkith
3 385
I have been looking at the difference and I know one is power and one is energy. I understand that a 2kW kettle on for...
Jan24-14 02:57 AM
danny.mcshane
12 485
Can bringing a surplus of Helium 3 from a Extraterrestrial source effect our earth's ecological balance? Has there...
Jan24-14 01:06 AM
SteamKing
4 323
Hi all - I was having a debate with some students in my flipped class today and I can't wrap my head around...
Jan24-14 12:10 AM
rcgldr
1 361
Hello. I know that more than 80 percent of the atmosphere of the Jupiter is the hydrogen. Does this fact mean that...
Jan23-14 10:30 PM
mheslep
12 549
Hello everyone I need some one once and for all to give me the steps to have a clear step by step idea about the...
Jan23-14 09:20 PM
eahaidar
9 551
In an inelastic collision of a moving billiard ball with a second ball at rest, I understand that the two balls have...
Jan23-14 08:35 PM
AlephZero
4 468
Good day all, I am simply curious, so excuse my ignorance, I am not a scientist... I wish to posit a question...
Jan23-14 04:46 PM
pervect
13 630
I understand that voltage depends on how far the electrons are, so for a sphere it would be q*k / r. But what if a...
Jan23-14 03:55 PM
mfb
1 300
Has anyone here ever done this experiment? A buddy of mine and I were thinking of setting this up but we had a few...
Jan23-14 03:30 PM
connorp
1 372
I have : Cylinder : 958,000 lbs Motor 200 HP required RPM : 5 time : 60 seconds Torque: 18,757 lbs-ft What...
Jan23-14 01:16 PM
cjl
1 306
I have designed and built a device that harnesses centrifugal force.The power output is in the form of 2 x 10mm...
Jan23-14 12:37 PM
billbarlow
7 474
Let's talk about Nearsighted people. Nearsighted people creates the image of far objects in front of the retina,not...
Jan23-14 11:03 AM
jtbell
7 408
Hello PF:smile: Up till now i have learned that something that has the ability to do force*displacement is...
Jan23-14 09:58 AM
HallsofIvy
3 340
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
Hello, I'm currently a student in AP Physics having a little trouble with the concept of tension, especially that of a...
Jan23-14 07:19 AM
Chestermiller
4 454
Hi, I was reading a paper on circuits, electric field and resistance.Now i have a question , the paper says that in a...
Jan23-14 06:20 AM
Mr.Bomzh
72 2,174
This might sound like a ridiculous question and I am sure it is (they don't build them like that for fun) but why on...
Jan23-14 05:47 AM
danny.mcshane
20 825
I'm reading about electromagnetic waves and I can't make sense of their self-sustaining nature. If a charge...
Jan22-14 07:15 PM
davenn
2 338
Newton's Third Law states that for every action force, there is a reaction force. So take a classical problem with...
Jan22-14 07:09 PM
DaleSpam
9 454
Black garment vs white garment in summer . How much extra energy is absorbed with black clothes ? How to quantify...
Jan22-14 04:52 PM
sophiecentaur
13 829
I don't know what is the principle of Fizeau's method. In the experiment a rotating toothed wheel is used.But why the...
Jan22-14 04:51 PM
sophiecentaur
9 346
So im a little confused about how to calculate the error uncertainty of a slope. Lets say I have data points (1,2),...
Jan22-14 01:56 PM
jtbell
1 336
Hello! I'm was wondering if there is anyone that could help a Marine Biologist finding a "simple" way to calculate...
Jan22-14 12:58 PM
JoaoCorvina
2 202
Greetings PFers, I'm working on a project where I need to focus powdered that is being blown through a tube. I would...
Jan22-14 11:41 AM
taylaron
1 331
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
3 256
Hello! I am participating in a STEM fair(I am a middle schooler), and my scientific question is : Does the angle...
Jan21-14 09:35 PM
ShrodingersCat
2 391
In the simple torque equation: \tau_z = \alpha_z \times I \frac{\tau_z}{I} = \alpha_z Finally: ...
Jan21-14 05:06 PM
alva
22 843
Hello, I have two fish tanks next to each other. One is big (36 gallons, about 2 feet tall), one is smaller (10...
Jan21-14 12:49 PM
mtsafer
9 411
I was just wondering why a body immersed in a fluid at rest experiences a perpendicular force on its surface? Why cant...
Jan21-14 10:32 AM
Chestermiller
17 741
Can someone explain to me in terms of a thought experiement (not equations, please) why it is that inertia exists...
Jan21-14 05:24 AM
Malverin
18 874
I was reading The History of Physics by Isaac Asimov, and I came across this passage. "Imagine a body dropped first...
Jan21-14 04:16 AM
sophiecentaur
4 448
http://books.google.com.au/books?id=x-XZBJngdM4C&printsec=frontcover#v=onepage&q&f=false This post is referring to...
Jan21-14 12:50 AM
That Neuron
0 351
If gravity is a force, why can't we use it as an energy source?
Jan20-14 04:23 PM
kalish
13 559
For the sake of argument, say an proton traveling at near light-speed having momentum far exceeding the earth's were...
Jan20-14 04:14 PM
kalish
10 464
I would like non-dimensionalize the equations which describe a non-Newtonian fluid model. In the constitutive equation...
Jan20-14 03:19 PM
DaleSpam
4 442
A most common tool in engineering is "Dimensional Analysis": http://en.wikipedia.org/wiki/Dimensional_analysis ...
Jan20-14 03:10 PM
D H
2 358
I believe it is correct that if you spin up an object in space, like a space ship, it will continue spinning...
Jan20-14 01:44 PM
pikpobedy
3 382

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