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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
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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
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I am looking for a material that will change colors depending on how long it is in the sunlight. Any thoughts?
Jun18-13 05:29 PM
sophiecentaur
6 753
I am confused about spontaneous fission. My basic understanding is that like α-decay the tunnel effect is responsible....
Jun18-13 04:35 PM
Crazymechanic
6 806
...what mass would I need to covert to pure energy (roughly)? Like, they say a paper clip converted into pure...
Jun18-13 09:29 AM
Vierstein
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Human being's can't take exact random samples from continuous distributions like the uniform distribution on . If...
Jun18-13 07:57 AM
kith
24 1,452
Hello Physics Forums, this is my first thread here. My daugher of 9 years is getting interested in the moon and...
Jun18-13 04:01 AM
256bits
3 719
You lift a 50 lb weight by a distance of 4 ft so you do 200 foot-pounds of work. You then hold the weight and walk a...
Jun18-13 01:53 AM
dreamLord
1 542
Say if an iron disk slides down a non ferromagnetic conductor ramp and we get a certain time. And then we have an iron...
Jun17-13 10:45 PM
wukunlin
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For the decay chain N1 -> N2 -> N3 -> ... -> Ni -> ... -> Nd, how can I find the amount of particles of Ni, n(Ni), at...
Jun17-13 06:47 PM
mfb
1 508
Let me begin by saying I do not have a background in physics, or science for that matter! I just have an interest in...
Jun17-13 06:46 PM
atyy
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Hello, am working with luminescence spectra, including excitation and emission spectra. When you makes an initial...
Jun17-13 05:57 PM
birdmani
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From my understanding it's impossible for electrons to directly turn themselves into neutrons and protons. Electrons...
Jun17-13 04:41 PM
Jano L.
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I saw this video a long time ago and just assumed it was fake, but I just saw it again and honestly don't know how...
Jun17-13 04:35 PM
Crazymechanic
3 599
°Hey guys, so I'm in year 12 and ive got to do an individual investigation about anything I want for my Welsh Bac...
Jun17-13 04:14 PM
berkeman
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Hi my name is Bruno, I'm 19, I'm currently finishing my 12nd grade on arts. I'm annoyed because no one I know can...
Jun17-13 02:51 PM
russ_watters
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In thermoelectric series, lead is arranged in the middle and other metals arranged both on the left and right hand...
Jun17-13 01:06 PM
ananthu
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I'm having difficulty reproducing an experiment I remember from high school. It's basically a glass bottle with a...
Jun17-13 12:26 PM
sophiecentaur
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Hello physicsforum, As the topic name says, I would like to know if a photon forming electron-positron pairs...
Jun17-13 11:25 AM
ZapperZ
7 897
Hi all, I would appreciate a little guidance on some circuit theory. I was wondering how a circuit behaves when there...
Jun17-13 10:17 AM
sorax123
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Hi Assume that the Foucault's pendulum is located in N pole and is oscillating from W to E (x direction). The Z axis...
Jun17-13 07:29 AM
A.T.
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I have an x-ray tube. When I see the spectrum, I notice the characteristic lines of the anode. What do I have to do if...
Jun17-13 07:12 AM
Simon Bridge
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I thought about posting this in the math forums, but I'm curious about what integrals actually represent as applied to...
Jun17-13 12:12 AM
tchen
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Hi, can anyone explain to me why wavelength is a limiting factor in determining whether a radio wave will pass through...
Jun16-13 10:05 PM
Simon Bridge
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Just curious if anyone knew about any progress with higher critical temperature superconductors, whether they're...
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Groothouse
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What happens when you blow bubbles at a van de graaf, and why does that happen? I know that the bubbles will repel...
Jun16-13 07:51 PM
Bobbywhy
1 566
Since I couldn't start a thread in the learning materials section , I thought this would be a suitable place. Im...
Jun16-13 04:33 PM
DrPhoton
4 819
Hi guys! I'm a third year physics student. and I'm studying mathematical physics and particle physics. I thought of...
Jun16-13 03:37 PM
Khashishi
3 964
This isn't a homework problem, but something that has being buzzing in my head. I've been thinking about it cause...
Jun16-13 09:50 AM
mfb
5 779
Hi, One can register waves of light. Is there anything known different then stars where we receive information...
Jun16-13 05:07 AM
NascentOxygen
6 750
Please, explain the concept of terminal velocity on the help of rain drops... Is there is any retardation when rain...
Jun16-13 01:52 AM
SarcasticSully
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Hello, In the early stages of Cosmic Inflation, immediately after the Big Bang, all matter was basically energy in...
Jun15-13 11:05 PM
Kylie87
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Hello all, I am a newbie here but have a question that I was hoping someone could answer. Would a permanent magnet...
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mrspeedybob
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I am a high school teacher and I just came across this issue when I began teaching at a new school. I am positive that...
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tompalatine
5 802
When we have ethanol on our skin it feels colder than when we have water on our skin. The explanation given was that...
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Khashishi
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What possible rate of electricity would be generated if a 10,000 lb weight goes down a 30 degree inclined track,...
Jun15-13 12:37 PM
russ_watters
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I'm studying wave interference and having trouble to understand some concepts. I would like to ask what would happen...
Jun15-13 10:57 AM
Redbelly98
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I have two examples.Terminal velocity-When the forces are balanced,the person continues to fall down at a constant...
Jun15-13 10:10 AM
Nugatory
25 2,170
Hi A Foucault's pendulum consist's of a heavy weight at the end of a long string with the string so suspended that it...
Jun15-13 06:29 AM
mfb
10 836
Hi forums. I have what I think is a simple question but I'm making myself confused. I'm trying to work out the...
Jun15-13 06:03 AM
gadong
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Hi I have always wonder about this. I understand the concept of bevel gear, but never quite see how the involute...
Jun15-13 12:38 AM
hihiip201
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http://img822.imageshack.us/img822/6069/3naz.jpg I was watching TV and noticed a lot of flashing lights outside...
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astroscout
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