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

Apr2211 05:26 AM
ZapperZ

1 
45,678 
Does any one know of a constitutive equation for a an orthotropic temperaturedependent material that has different...

Oct113 08:06 PM
JTVT

0 
346 
I am trying to define the stress strain relationship for a viscoelastic material. For a Maxwell model, I have the...

Jan211 07:59 PM
Mapes

1 
4,606 
I've read conflicting descriptions of the relationship between constraint forces and virtual displacements that I'd...

May412 12:49 AM
ralqs

0 
685 
Hi!
I tried to compute an ideal barbellshaped object's dynamics, but my results were wrong.
My Langrangian is:
...

Jun1613 08:36 AM
Jengalex

2 
524 
In the textbook photonics 6 chapter 1 Example 1.1.1 saleh and Teich , I'm supposed to derive snell's law using...

Oct811 12:01 PM
med17k

0 
954 
could you please tell me how can the accelaration of masses m1 and m2 can be different.
i am in a great necessity.so...

Oct911 05:42 PM
PiBond

2 
2,106 
Can questions like the one given in the following pic be solved by taking the reference frame answhere in the middle...

Jul3110 09:41 PM
sid95

2 
1,987 
Can gravitation be a constraint force?

Feb913 01:39 PM
DaleSpam

1 
565 
the fundamental basis of the lagrangian formulation is the fact that the virtual displacement are perpendicular to the...

Sep1708 01:27 PM
Machinus

4 
15,156 
Suppose you are trying the solve the equation of motion of say a particle constrained to move on a surface...

Jul1012 04:33 PM
supernova1387

1 
890 
when a particle is constraint to move on a circle, what are the constraint forces

Feb211 02:41 PM
Studiot

12 
1,370 
http://m.youtube.com/watch?v=8X1x9RLaaxc
he tells number of contraints (he write no of pairs ) is nC2 how is it, i...

Oct2513 02:07 AM
DrClaude

7 
656 
the question is if we have the constraint:
g(q,p)C=0 for a real number C then we have that derivating this...

Jan1807 06:31 AM
Kevin_spencer2

0 
1,862 
My question is about the constraints in Hamiltonian viewpoint. I mean, where the constraints are put into the...

Oct1107 11:53 AM
somy

2 
2,324 
Hello, all.
I'm wondering about matrixvariate normal distributions. I know they normally assume an n x p random...

Jul1212 02:49 PM
jssdenton

0 
592 
Is it possible to construct a hall effect transducer without the use of ptype semiconductors? I've been looking into...

Nov2611 01:41 PM
tummychow

2 
2,494 
Hello:
I am trying to understand how to build a hamiltonian for a general system and figure it is best to start...

Aug1011 01:31 PM
mathfeel

4 
2,241 
Well, it's more or less for robot constructon thing. Does anyone know if it's possible to construct a small EMP device...

Oct3104 01:36 PM
Zeteg

4 
4,329 
Consider two identical optic fibers with deeply subwavelength tips. Let their tips be placed next to each other, at a...

Sep1110 09:17 AM
Dr Lotso'watts

20 
2,619 
Can anyone explain point 44 of the attached pdf document on surface tension.
(Here's the link in case attachment...

Jan2713 07:06 AM
andrien

1 
526 
Can anyone explain point 44 of the attached pdf document on surface tension.
(Here's the link in case attachment...

Feb1513 09:56 AM
amk_dbz

0 
466 
Hi,
when two cylinders in contact, but not parallet to each other (skewed), are rotating, there is a development of...

May1707 11:56 PM
Luiz Cavatte

2 
1,896 
The maximum I have found about contact force is very roughly this: it is nothing but electromagnetic force, meaning...

Nov608 08:47 AM
Andy Resnick

2 
1,485 
What kinds of tanks are capable of resisting these types of pressures? (30,000 psi). I can't find any tanks that...

Dec2804 06:25 PM
brewnog

25 
4,871 
Hey guys,
First time posting. I was thinking of starting an extra credit paper for my Physics 1A course, and was...

Nov811 09:57 PM
Dickfore

1 
1,200 
How do you solve the following problem:
You are in charge of keeping the drinks cold for
a picnic. You have a...

Jul2012 04:50 AM
mfb

1 
584 
I apologize in advance for the length of this post, if you wish to reduce reading skip to paragraph 5. Or if you are...

May1913 12:13 PM
Cameron Blake

9 
728 
Hi
Friends, consider a pipe of uniform cross section held vertical and water flows through it top to bottom. Now if...

Mar1110 12:20 PM
tinytim

18 
1,749 
Imagine a jet of fluid (perhaps air) impinging on a flat plate. It could be said that the jet has a slightly higher...

Jun409 07:38 AM
parsec

1 
1,288 
Hi all, first post here.. I hope you guys can point me in the right direction.
I am writing a multiplayer game and...

Jun905 02:33 AM
kunos

0 
1,177 
I have a question about the derivation of the boundary conditions at surfaces of electromagnetic fields. These...

Mar1013 01:59 PM
jasonRF

1 
612 
Although continuity equation is often part of fluid mechanics, does it have an application in air flow? For example,...

Jun2013 07:31 AM
boneh3ad

3 
562 
Greetings,
In Griffiths E&M, 3rd. Ed., on page 214, the following is part of the derivation of the continuity...

Sep1713 11:08 AM
Chestermiller

6 
658 
Please consider a Utube filled with an incompressible fluid as in the attached figure. Piston P divides the fluid in...

Sep2308 10:39 PM
rupam_iit

6 
2,567 
Quantities, like photons, alpha/beta particles, can travel with a billiard ball like behavior. There are two...

Aug1909 03:22 AM
John Creighto

0 
591 
Hello
I have found in some text books that the magnetic scalar potential is continuous across a boundary. Now, how...

Oct1711 07:37 AM
baggiano

2 
1,546 
Suppose that we will proof the continuity of the first maxwell equation:
So we have div(\vec{E})=\frac{1}{\epsilon...

Nov307 09:46 AM
Bert

2 
2,345 
I have followed a derivation of the continuity equation, and it uses the divergence theorem at some point, but looking...

Mar1409 07:47 AM
ballzac

4 
2,238 
Hi,
I am trying find equations for continuous "stretchy" collisions, in other words, I have two perfectly round...

Apr1112 06:54 PM
mindoftea

3 
1,186 
Hello, i am trying to remember the name of the guy who created a water fountain that seemed to recycle its own water...

Apr2109 11:13 PM
russ_watters

15 
12,238 