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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
168 183,632
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 68,937
Is it possible to light a globe - a normal energy efficient globe of 10 Watt usually powered by 240v or so. Can the...
Aug21-09 09:55 PM
dvn
9 1,054
When work is done on a Coulomb of charge, it gains potential energy equal to the amount of work done on it. Now, since...
Aug21-09 07:08 PM
Red_CCF
6 1,236
According to wikipedia below: > Huygen's principle states that each point of an advancing wave front is in fact the...
Aug21-09 11:55 AM
manvir
27 6,554
This question has to do with some annoying anomaly when expressing in scientific notation whole numbers that are...
Aug21-09 09:44 AM
jtbell
5 3,324
Well, i know i might be far oversimplifying this as its not understood properly by science yet but. A permanent...
Aug21-09 07:17 AM
gmax137
2 1,041
Hi everybody! I am trying to model a lense shape using two circles of radii R and r, with one at the origin and the...
Aug21-09 12:04 AM
Unit
0 1,171
This isn't homework, I really have this setup. :-) I have an 18" mirror with an 80" focal length. The light from a...
Aug20-09 08:31 PM
iansmith6
2 1,020
As my name indicates, I enjoy archery (specifically bowhunting). I am in the process of determining the ideal weight...
Aug20-09 08:06 PM
berkeman
20 1,632
Do neodymium magnets polarized like this and with this same shape exist? ...
Aug20-09 05:44 PM
RestlessMind
11 10,259
Both are near silent and 100% (in)efficient, but does the convection heater (with the electric coil where heat rises...
Aug20-09 04:12 PM
Twinbee
2 7,723
I am curious about any equations (whether empirical or no) that can predict the thickness of metal (on a glass...
Aug20-09 10:04 AM
Degeneracy
0 1,602
Hi All, A friend and I were recently considering the idea of measuring water flow in a fire hose, buy measuring the...
Aug20-09 02:40 AM
Danger
3 785
1. Can anyone please explain in detail How a Vortex if formed. I mean what are the reasons and physical phenomena...
Aug20-09 02:34 AM
RohansK
5 6,860
link Has anyone tried this? It looks really cool, and I am thinking about giving it a shot, but I'd like to know...
Aug19-09 09:14 PM
Quantum_Grid
13 2,729
we can see very hot fire and we can see cold fire. when fire is very hot it turns blue. now someone told me the...
Aug19-09 07:51 PM
jpreed
1 1,027
Yeah, why do they need to place plasma rockets in a vacuum? Temperatures? Air resistance from the particles? Is there...
Aug19-09 07:43 PM
MATLABdude
1 834
So I was watching the Sun set the other night, and I noticed that the Sun appeared to accelerate into the horizon. If...
Aug19-09 06:09 PM
Andy Resnick
5 1,334
I know there are different types of waves in matter, for example P waves, S waves, etc. But do these correlate to...
Aug19-09 04:00 PM
szekely
1 978
why we can heat food with microwave and not light wave (the light we can see) fast?
Aug19-09 03:02 PM
Danger
4 2,881
Does anyone know why you can see the smoke coming from dry ice? Is it actually CO2? It does not make sense to me, why...
Aug19-09 02:45 PM
Dadface
7 1,250
I am slightly confused about an experiment to demonstrate centripetal force. Suppose a tennis ball is attached to a...
Aug19-09 12:06 PM
sganesh88
6 4,829
how a light is able to focused in one direction? after the light gets reflected in the reflectors or dishes it is out...
Aug19-09 09:38 AM
rajeshmarndi
5 1,558
Hi, I am just wondering is there such thing as perfect crystal. I don't know much about this stuff. It seems to me...
Aug19-09 08:32 AM
DaveC426913
14 5,346
Hey guys. I'm trying to figure out the spring constant of a bungee cord. Weight = 80kg Gravity = 9.8m/s/s Length...
Aug19-09 07:21 AM
the_awesome
4 1,234
A train is travelling at the speed of a bullet. A man, stood on top of the train, fire's a gun in the direction...
Aug19-09 04:05 AM
fatra2
1 1,786
Hi, The way I understand it (and correct me if I'm wrong). Sometimes a star collapses on itself and forms a...
Aug18-09 11:37 PM
sylas
18 2,158
Hi, i've been pondering over the properties of a beam of light and i'm curious if the concentration of photons in eg....
Aug18-09 09:55 PM
Andy Resnick
11 2,666
This question came to me as having an obvious answer yet I dont know. If a human is floating in space they bend...
Aug18-09 09:17 PM
Redbelly98
2 875
This one has also puzzled me for quite some time. How come that glass, water and diamonds for instance are...
Aug18-09 02:09 PM
triac
0 524
Ok, so I've been thinking on this one for quite some time: How is it possible to obtain a characteristic spectrum...
Aug18-09 02:03 PM
triac
0 861
Is this the right format of the energy equation (equation 2.10)? ...
Aug18-09 09:42 AM
MasterD
2 1,083
I was watching this E & M lecture...
Aug18-09 08:07 AM
Born2bwire
1 1,224
Are electricity and magnetism field lines the same? please be detailed!
Aug18-09 08:07 AM
DaleSpam
2 1,066
Does anyone know how to generate the frequency in hertz of a note(middle C, F# ,G etc.) programatically assuming that...
Aug18-09 04:19 AM
DrGreg
5 1,398
one of the laws of friction states that the frictional force is independent of the area of contact,and velocity,how...
Aug18-09 03:22 AM
Shooting Star
14 2,161
Hello, I'm performing some experiments for a research project that involve electrospinning. The basic apparatus is...
Aug18-09 01:21 AM
dredd2929
0 1,750
Hi guys, for an electron to jump from a lower energy to a higher energy state, it must absorb photons that correspond...
Aug18-09 12:17 AM
sylas
1 735
Hi fellow thinkers. I need constuctive criticism on the following:- Imagine a tube circling around into a closed...
Aug17-09 10:51 PM
LeonStanley
9 4,182
Hey guys, I have a short question here. If a resistor and a capacitor are connected in a series, it takes 2 seconds...
Aug17-09 04:38 PM
Dadface
2 972
I need to do some research on the physics of F1, and it can't be too complicated. I've already got centripetal force,...
Aug17-09 01:49 PM
freeman2
8 1,984

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