
Before posting anything, please review the Physics Forums Global Guidelines.
Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
46,979 
I was wondering how protective a Faraday Cage actually is, can it be overcome by sending more amperage onto the...

Jan813 08:20 AM
yoyopizza

17 
2,305 
dV/dS*v=a
now at the higest point when we throw a ball.
v=0
which implies a=0
but that is npot true....any...

Jan813 05:26 AM
tinytim

8 
938 
I am having trouble thinking about self induction in the primary coil... My text says in standard situation the self...

Jan813 05:19 AM
Ezio3.1415

7 
1,271 
Hello,
Can anybody please explain me:
While going through gravitation potential energy, I came across:
...

Jan713 10:52 PM
shounakbhatta

15 
1,424 
In solving linear circuit problems using complex currents, charges etc. I have stumbled upon something I never really...

Jan713 06:46 PM
Simon Bridge

3 
625 
I am quite confused about this area.
First entropy does not contain any reference to volume. So if we can...

Jan713 11:27 AM
Rap

9 
1,067 
Im trying to calculate the refelction angle of 2 points in a 2d plane, but not the same distance away from the...

Jan713 09:03 AM
becka221

2 
938 
Hi,
I wanted to create electromagnet around pipeline to produce 0.2 Tesla magnetic field. How can it be connected...

Jan613 11:51 PM
Drakkith

1 
505 
I'm trying to calculate insulation thickness for a foundry, and can't figure it out after spending a few hours...

Jan613 06:22 PM
haruspex

2 
876 
Does a uniformly accelerated charged particle radiate em waves?
The equivalence principle says that a particle in...

Jan613 12:54 PM
Andrew Mason

33 
3,082 
Hi everybody,
first time poster here. I am working on calculating the force of magnets in a 3 dimensional space. I...

Jan613 10:30 AM
Jano L.

3 
988 
I am participating in the IYPT and i have encountered a question on elastic space which relates to gravity wells. I...

Jan613 10:27 AM
vishnu manoj

6 
1,454 
Why does frequency of a wave stay the same during transmission and reflection?

Jan613 09:45 AM
mfb

1 
764 
Hi PFers. I am interested in Maxwell Boltzmann Distribution. I have searched in Internet for the derivation but I am...

Jan613 08:40 AM
Troller

4 
768 
If I charge a van de graaff to say 10,000 V I would think of the voltage as electric pressure. There would be so many...

Jan613 07:49 AM
Redbelly98

2 
700 
Hi there! I am working on a project that requires some idea of adiabatic processes. I know the basics of the said...

Jan613 01:21 AM
andrien

4 
810 
Hello,
Can someone please explain me:
F=G m1xm2/R^2
In potential energy U=mgh
Generally it is also written...

Jan513 03:46 PM
tinytim

3 
826 
If you heat the air inside a rigid, sealed container until its Kelvin temperature doubles, the air pressure in the...

Jan513 12:25 PM
jtbell

1 
902 
hi PF, i got a question in my mind while studying electrostatics that
Will a charged particle loose its charge if it...

Jan513 09:14 AM
dev70

11 
1,021 
I have been told that compressing the mixture would make the explosion "more powerful". However I cannot wrap my head...

Jan513 08:20 AM
Studiot

6 
1,411 
For example in this video at 5:00:
http://www.youtube.com/watch?v=odpsm3ybPsA
They show by turning the gear with...

Jan413 11:35 PM
theBEAST

4 
1,015 
Hi everyone, I don't mean to offend anyone (actually I'm looking for help), it's just that I am having a hard time...

Jan413 07:28 PM
Holbridge

6 
1,081 
Suppose I want to try and guess the fields of a short laser pulse. We know that fields that satisfy Maxwell's...

Jan413 05:20 PM
Spinnor

2 
688 
1) when a wheel turns there is a forward acting friction but the 'frictional' force that opposes it is rolling...

Jan413 05:00 PM
tinytim

54 
6,889 
Hello.
I'm looking for a lens that can collimate (or focus far away >500mm ) a light coming out from a LED.
...

Jan413 01:53 PM
Integral

3 
863 
This is a question I've been trying to figure out. I'll try my best to formulate it, so apologies if it's a bit ill...

Jan413 12:28 PM
randomafk

0 
513 
Hello,
I need to calculate/estimate the force between a solenoid electromagnet and a piece of iron on a certain...

Jan413 09:43 AM
Heissenberg

2 
1,291 
Hello everyone!
I was just reading about the working of Newton's Cradles and ended up having some confusion.
...

Jan413 09:16 AM
A.T.

6 
1,058 
Could someone please show me how to calculate the deformation of a pad (ideal material with the same elasticity at all...

Jan413 06:50 AM
Studiot

16 
1,585 
Enthalpy is a state function because it only depends on the initial and final state.
Work is a path function because...

Jan413 04:37 AM
Studiot

15 
1,667 
Hello everyone i bought a kit for my senior project on electromagnetic levitation. It uses an electromagnet to suspend...

Jan313 11:34 PM
wubbzee

4 
945 
We are usually told in an introduction to general relativity that when special relativity was completed, there was a...

Jan313 08:58 PM
LastOneStanding

2 
606 
I thought of this question the other day, and I was unable to solve it. A Google search has not helped, so I thought...

Jan313 06:11 PM
tinytim

3 
770 
I was watching a video on the internet about charge distributions over solid conductors. The solid conductor was...

Jan313 03:08 PM
CAF123

2 
711 
I have been scanning a physics book. See attachment. The diagram shows that a light bulb has a continuous spectrum...

Jan313 12:13 PM
barryj

8 
831 
Here is a picture of a situation I thought of:
http://i.imgur.com/mLr3Q.png
The circles between the magnets...

Jan313 06:50 AM
BruceW

21 
1,429 
Hi,can someone explain me this picture? : http://www.accessscience.com/search.aspx?rootID=792797
I dont...

Jan313 05:49 AM
thedy

3 
2,171 
I'm confused about the single slit diffraction pattern. Why are light and dark patterns? Where is the constructive and...

Jan313 03:20 AM
Drakkith

4 
625 
β= (1/v)(∂v/∂T)constant pressure.
What is the v represent? molar volume?
If I am given the β and the change of...

Jan213 08:14 PM
Chestermiller

5 
975 
This is not a home work, it is part of the text book on elliptical polarization. Attached is a page in Kraus Antenna...

Jan213 07:13 PM
yungman

0 
910 