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Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
45,480 
I notice that sometimes there may be 2 ways of getting to the answer  using energy, or "forces'. Can I always just...

Jun1411 10:24 AM
I like Serena

8 
1,633 
Hello all,
I'm currently working on some magnetic shielding, and my supervisor wants me to try and find an...

Jun1411 06:16 AM
Born2bwire

5 
941 
I'm a mechanical engineer and I'm really interested in electrical systems. I understand a fair amount about the basics...

Jun1411 05:52 AM
The_Duck

6 
2,143 
Hi everyone!
I'm new to this forum. I enjoy physics but I'm full of doubts :)
Now I'm trying to understand how...

Jun1411 05:50 AM
luis20

2 
1,447 
Hey, all.
I'm tutoring a freshman, and we've come to this particular problem, and I think there's missing data. He...

Jun1411 04:41 AM
Metaleer

3 
1,490 
if we have cylinder full of water on a scale the we heat it, does the scale show any difference in weight of...

Jun1411 03:00 AM
Lsos

2 
999 
Can anyone explain the mechanics of a chain hoist and its mechanical advantage, in mathematical terms,???
thank you...

Jun1411 12:20 AM
JohnMorriss

3 
1,644 
Hallo,
I hope someone can help me with the following question:
A submarine conatins 1000m^3 of air and has a...

Jun1311 08:55 PM
nasu

2 
1,480 
I'm going into my third undergraduate year and have yet to take a course on thermodynamics and statistical physics,...

Jun1311 07:53 PM
Pengwuino

3 
593 
Hello friends .. I did a physics exam last week and had many doubts on questions 1  d) e) and 2  b) c) ... I tried...

Jun1311 07:31 PM
pupiloslash

1 
933 
Hi everybody.
That's my first (of many) post here!
I'm a brazilian guy who is trying o solve de Wopho's Problems....

Jun1311 04:51 PM
nekronaut

3 
987 
I'm trying to understand how the polarization of an incident laser, (280.5 nm YAG in this case horizontally polarized)...

Jun1311 03:50 PM
Jimbone

0 
474 
Hello,
I need some help in a matter.
I donīt have any great knowledge in thermodynamics.
If I have a plate of...

Jun1311 12:51 PM
ladil

4 
1,133 
hi all
why do many things in physics move in waves ?
in fact , if im not mistaken , everything apart from mass...

Jun1311 11:23 AM
Studiot

37 
4,633 
What is the proof that the total rate at which radiation is emitted by a blackbody radiator is proportional to the...

Jun1311 11:19 AM
Lakshya

2 
872 
For my classes I want to prepare this experiment http://fizyczny.net/viewtopic.php?t=28422 But of course I need to...

Jun1311 10:33 AM
chrisbaird

2 
1,420 
here is the thing, I have understood this in dielectrics, and I know that we have a new vector field instead of E, the...

Jun1311 10:09 AM
chrisbaird

1 
619 
Why do materials like aluminum cut down the value of the B field?
Like suppose we had an infinite current carrying...

Jun1311 07:07 AM
cragar

4 
591 
I know how photons are diffracted round a corner in quantum mechanics. But is there also an explanation in classical...

Jun1311 07:06 AM
sophiecentaur

12 
1,696 
How does lightning cause a voltage spike? Is it the changing magnetic field caused by the lightning current that...

Jun1311 06:54 AM
sophiecentaur

1 
1,765 
Hi,
I had a question in my exam at my college that I did not quite know how to answer.
Why is the study of...

Jun1311 04:24 AM
Born2bwire

8 
1,233 
The electric field at a point P pointed by the position vector \vec r \;\hbox {, from a moving point charge pointed...

Jun1311 03:54 AM
Born2bwire

9 
2,028 
OK...
My question is, if I have so system like square loop... and all the donations be summed up by Bcos(Tetha) or...

Jun1311 03:04 AM
Born2bwire

3 
964 
Hello Physics Forums! Longtime lurker, first time poster here.
I've got a deceptively simple question that had my...

Jun1311 01:30 AM
ifnspifn

0 
848 
Given a set of a scalar function V and a vector function, how does one recognize that it is a coulomb gauge or lorentz...

Jun1211 09:04 AM
Vanadium 50

4 
7,487 
my understanding is that energy is wasted in a solar cells when light with more frequency than necessary to make an...

Jun1211 06:36 AM
thopsy

1 
1,291 
Could you possibly comment the following statement:
'Heat propagation is a semideterministic process in that its...

Jun1211 06:04 AM
vanhees71

2 
656 
This is perhaps more a maths question, but it's about a piece of maths that physicists use a lot, and I'm interested...

Jun1211 05:39 AM
Studiot

21 
2,576 
I know that all bodies with a temperature above absolute zero radiate energy away as the following.
P = AeσT^4
...

Jun1211 12:36 AM
Andrew Mason

2 
742 
Divergence and Curl in cylindrical and spherical co are:
\nabla \cdot \vec E \;=\; \frac 1 r \frac {\partial r...

Jun1111 06:57 PM
RedAnsar

17 
4,437 
I'm looking at a question in a grade 8 science textbook.
It asks what would happen to the buoyancy force if gravity...

Jun1111 04:12 PM
GRDixon

5 
1,782 
Is there any printing technology that can print small enough parallel lines on, say a glass or clear plastic...

Jun1111 12:53 PM
arydberg

4 
902 
Hello everybody.
I have the following problem:
I am given a Speed distribution function, f(v). This distribution is...

Jun1111 09:32 AM
Petr Mugver

4 
1,709 
Hi.
I have a question concerning the magnetic momentum of a current loop.
We know that if we have a circular current...

Jun1111 09:14 AM
Gavo

2 
2,706 
I almost all movies where you could see an animation about an asteroid, they move in a very distinct way.
I don't...

Jun1111 09:07 AM
zsero

14 
5,344 
Hi all I am new here!!
can anyone tell me how can i rotate the object around it's center of mass and not the origin...

Jun1111 08:18 AM
mahi.aw

6 
1,669 
I can show that Coulomb's Law + superposition implies \nabla \cdot \mathcal {E} = \frac{\rho}{\epsilon_0} and \nabla...

Jun1111 03:47 AM
henry_m

3 
826 
Hello Forum,
the formula for skin depth is both inversely proportional to conductivity and frequency omega.
There...

Jun1111 12:40 AM
Antiphon

3 
1,635 
This is weird, I have no clue on how to solve the following question that I "invented" while walking in the street due...

Jun1011 10:56 PM
fluidistic

5 
1,361 
Hi everyone, just some background informationI work in an emergency department as a trauma tech. My coworkers and I...

Jun1011 10:31 PM
berkeman

77 
8,496 