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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
168 186,642
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 69,515
I had a decent amount of physics in my EE education but I've watched the Susskind lectures and learned that there are...
Dec27-11 06:16 PM
csmcmillion
0 934
Hello, This is something that's puzzled me for a while, but I haven't been able to find any conclusive answers...
Dec27-11 03:52 PM
Drakkith
7 2,605
The definitions which i found on surfing the net is too vague.Can someone help me with this?
Dec27-11 03:22 PM
Drakkith
1 2,654
This has been bugging me and I just can't seem to figure out a solid answer. My electric stove has different sized...
Dec27-11 12:59 PM
sophiecentaur
11 3,593
HEllo Can I find a physics reference for these three topics ?? I have Serway but it just mentions elasticity in...
Dec27-11 02:19 AM
JHamm
1 1,186
Hey all, In one of my textbooks, there is a passage in the thermodynamics section that states that: For a closed...
Dec26-11 11:41 PM
cjl
1 1,129
Flame in a centrifuge will go oblique (nearly parallel to the ground if the device is spinning extremely fast). ...
Dec26-11 09:45 PM
simplex
7 1,278
Hello. This has been bothering me. A point mass is on a rotating flywheel that has a constant initial angular...
Dec26-11 07:06 PM
rcgldr
5 1,862
Hello,world 1-"the intermolecular attractive forces between gas particles are very weak due to the large...
Dec26-11 03:44 PM
zhermes
4 2,112
I met this old nerd wearing a tie with a certain spiral, which does not look like a Bernoulli spiral to me. He...
Dec26-11 02:23 PM
Signa
7 1,415
I put a hamburger(wrapped by foil) into microwave and pressed start. I noticed an electric spark near the foil's...
Dec26-11 01:18 PM
GunUltimateID
2 1,183
hi, it's my first post in this forum so I hope I'm in the right section. I've asked three different physics teachers...
Dec26-11 01:00 PM
Danger
45 4,180
Lets say I have n number of masses, x1, x2, x3,...,xn. How do I find the center of mass of the group of masses? I'm...
Dec26-11 04:49 AM
Bread18
5 1,195
Being that both laws explain some kind of heat transfer I was wondering if they are in any way related.
Dec25-11 05:58 PM
Gordianus
1 1,599
I'm a little confused by the textbook I'm working from, which asserts: "the electrical field from an infinite plane...
Dec25-11 04:17 PM
Morgoth
8 3,063
what is unpolarized light?
Dec25-11 11:11 AM
jtbell
5 6,873
i am having problem with the nature of light. The sun is lighting the earth. Suppose there solar system was emplty....
Dec25-11 08:46 AM
Danger
5 1,177
A sound is measured to have a decibel level of 30dB. If the intensity is decreased by a factor of 2 by how much does...
Dec25-11 07:57 AM
jtbell
1 1,411
Hello all, I want to understand the molecular structure for different electronic components: Conductors - need to...
Dec24-11 02:53 PM
physickkksss
0 899
What would happen hypothetically if there was a positive charged particle the same size as an electron (that wasn't...
Dec24-11 11:11 AM
DaleSpam
9 2,216
Can someone show me how to calculate centre of gravity for a hemisphere shell??
Dec24-11 09:42 AM
Idoubt
6 6,833
This is always zero, right? What if you construct a closed surface which only encompasses one of the poles of a...
Dec24-11 03:31 AM
tomwilliam
2 1,421
Ok here is what I did: T=\int \vec{\tau} \cdot d\vec{\theta } = \int\frac{\mathrm{d} \vec{L}}{\mathrm{d} t}\cdot...
Dec24-11 12:48 AM
Curl
0 1,730
Hey, I'm looking for examples of Experiments by physicists who tried to prove a theory wrong, but ended up with...
Dec23-11 06:52 PM
Vanadium 50
3 1,957
Hey, I recently bought my gf a ring and would like to put it in a glass bottle and allow it to hang by a fish line...
Dec23-11 06:18 PM
DaveC426913
1 1,293
I'm willing to say that I have a fair understanding of Electromagnetism, at least from a classical perspective, but I...
Dec23-11 05:47 PM
Simon Bridge
14 1,776
I understand that magnetic flux through a closed surface is zero, but what is the exact definition of a closed...
Dec23-11 04:11 PM
tomwilliam
5 2,570
when a roller is rolling on a flat surface with a constant speed, how is about the friction force? is there any...
Dec23-11 03:46 PM
Curl
10 1,355
What is the main difference between Langrangian, Hamiltonian, and Netwonian Mechanics in physics, and what are the...
Dec23-11 02:41 PM
bbbeard
13 4,467
Speed is expressed with v. It's Unit is m(meter)/s(second) (m/s) Formula: v=s/t Road is expressed with s. It's...
Dec23-11 01:53 PM
micromass
5 1,294
I'm trying to plug in negative mass into conservation of momentum and energy equations. I want to see what would...
Dec23-11 01:00 PM
DrewD
3 1,209
Hi All, I'm designing an experiment and want to estimate the holding current (minimal current to maintain a spark)...
Dec23-11 11:03 AM
Naty1
3 1,531
On Light bulb appliances there is often a 60w limit. I would guess that a halogen bulb of 70w would produce less heat...
Dec23-11 08:49 AM
Vanadium 50
36 7,758
Hello everyone, I am really looking out for some literature which has reported the physics behind the occurrence of...
Dec23-11 07:46 AM
Andy Resnick
6 1,912
If a sound frequency is given at 1800Hz, how can I determine what range of low frequency would create a harmonic or...
Dec23-11 07:22 AM
olivermsun
14 2,330
Hey there! I'm doing some experimental work at a microscope, where the lamp in use is stated to be "Lamp bulb: 12...
Dec23-11 06:26 AM
sophiecentaur
2 2,088
is heat simply the mechanical motion of atoms and molecules, or is it the absorption of infrared radiation? heat is...
Dec23-11 12:26 AM
bbbeard
2 1,091
I've recently been told about the higgs boson or "god particle" ive heard it somehow endows particles with their mass,...
Dec22-11 11:25 PM
jtbell
1 1,890
Sorry for my lack of knowledge, I'm in Grade 7 I just learned that Magnets have dipoles--like this:...
Dec22-11 03:48 PM
Vanadium 50
9 1,955
If an object on a horizontal platform is moving at a constant velocity of 10m/s, and then begins to accelerate, what...
Dec22-11 03:34 PM
Doc Al
1 3,207

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