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

Apr2211 05:26 AM
ZapperZ

1 
47,855 
Everyone here should be familiar with the office toy known as Newton's Cradle where a ball collides with a group of...

Jan1310 10:11 PM
Prologue

8 
10,174 
I am trying to lift a load with a drill motor. I have a chain drive with a 3.7x1 ratio  13 teeth on the drive gear...

Jan1410 09:13 PM
volie1

10 
3,850 
Dear all,
As I understand the venturi effect, if a flow of water passes through a constriction, its velocity...

Jan1310 01:38 PM
amrbekhit

1 
15,581 
So, we learned about electricity in Physics a few months ago. One thing from the unit is still bugging me that I...

Jan1410 10:19 AM
SMc21

8 
5,356 
Does anyone know of any inelastic impact / collision equations or theories that somehow incorporate a spring constant...

Jan1410 02:37 PM
alext918

2 
1,021 
I understand why a heavy item and a light item both fall a given distance in the same time  in a vacuum, etc.
What...

Jan1110 06:58 AM
Gerenuk

3 
1,011 
Hi.
I'm beginning to study thermodynamics. I'm told that an adiabatic process is a process that is thermally...

Jan1110 08:40 AM
DocZaius

12 
2,165 
Hello everyone.
Que: Is there a reason for water flowing from a faucet to be narrower at the bottom then the top??...

Jan1010 11:26 AM
Prologue

4 
900 
Hello
Does anyone know where can I find a derivation (or approximation) for Huygens principle from more "basic"...

Jan1210 02:01 AM
Claude Bile

7 
1,801 
I'm setting up an experiment where I have a circular cathode releasing electrons to an outer circular anode. The tube...

Jan1010 03:46 PM
Bob S

6 
2,765 
I know this is getting really ridiculous but I have yet another question on Lagrangians...
This is our Lagrangian:...

Jan1210 01:13 AM
diazona

5 
1,039 
Hi. I'm a student in AP Physics this year and we started the E&M portion this week and we learned about electric...

Jan1010 04:23 PM
Durin

6 
2,993 
(Sorry for my poor English, Please, forgive mistakes, if any.)
Dear Friends
Not doubts about what is to be meant...

Jan1110 07:51 AM
BarbaraDav

5 
1,260 
Let's assume that electron is moving around the unit circle. Using Maxwell equations show what is the frequency of...

Jan1110 10:07 AM
GRDixon

6 
660 
Please see the attachment. There I have derived Kirchhoff's Voltage law from Faraday's Induction law. Reply me if I...

Jan1110 09:53 AM
emroz92

4 
1,166 
If we have a Lagrangian which looks like this:
L=\frac{m}{2}g_{ij}(x)\dot{x}^i\dot{x}^j
where:
...

Jan1110 12:41 AM
Prologue

5 
869 
I have an electrode that I'm trying to model. It's got v=0 at z=0, and v=V at z=H. I've been playing around with the...

Jan1210 06:19 AM
clem

2 
1,748 
If a force is applied to an object, will the object always experience the same linear momentum change regardless of...

Jan1110 07:35 PM
Gerenuk

9 
4,245 
If Light is EM wave, and antenna can emit EM wave, then can an antenna emit light? Is this a matter of designing the...

Jan1110 12:19 AM
saltine

2 
802 
Say you have a charge distribution in the picture, and you want to find the potential THEN the electric field at P,...

Jan1110 07:52 AM
Identity

4 
791 
Setup
Closed tube with a hole at each end. Microphone at one end attached to computer. Clap noise made at the other...

Jan1210 05:23 AM
Stonebridge

1 
2,464 
I'm interested in calculating the capacitive current when the electric field across a capacitor is given by a random...

Jan1110 05:36 PM
berkeman

3 
2,905 
inertia is the state of an object at rest and a body in motion will move at constant velocity unless influenced by an...

Jan1210 03:16 PM
GRDixon

3 
909 
If you have a sphere of metal electrically isolated by a vacuum, and continuously add negative charge to it, the metal...

Jan1110 09:24 PM
Born2bwire

1 
901 
I beg you to understand my poor Eng..
If there is any poor grammar or spelling..plz correct me..
While studying...

Jan1410 04:00 PM
Bob S

4 
1,387 
(Sorry for my poor English, Please, forgive mistakes, if any.)
Dear Friends
A system of second order, in normal...

Jan1210 08:40 AM
BarbaraDav

0 
1,150 
When an apple falls to the ground does it not exert some gravity of it's own on the earth and thus shortening the...

Jan1210 11:04 AM
mtasquared

3 
646 
I asked my professor, but he had no idea. Not really important, I guess, but I'd like to know.

Jan1210 10:36 AM
supijt

0 
3,095 
Hi.
I differentiated the equation of kinetic energy
E(v) = \tfrac{1}{2} mv^2
and I got:
E'(v) = mv.

Jan1210 04:04 PM
GRDixon

8 
8,370 
Hi, I understand that a conservative force cannot depend on velocity, because by changing velocity we can do different...

Jan1310 01:24 PM
Gaudium

2 
627 
How can you prove that the electric field is conservative? I've learnt about stuff like line integrals but I'm not...

Jan1410 11:09 AM
GRDixon

3 
2,900 
In the attachment, I have tried to bring out Doppler effect a bit differently than our normal textbooks. Please see...

Jan1310 01:45 PM
emroz92

0 
830 
I have to design a small aerator in the middle of a larger project . Therefore I need to have some design equations. ...

Jan1310 02:21 PM
Derulz

0 
591 
Hi Everyone,
I'm trying to find the eigenfunctions and eigenvalues for a quantum spinless particle within two...

Jan1310 07:21 PM
aurelio

0 
731 
It is a wellknown fact that Maxwell's Equations, along with Lorentz's Force Law, form a complete description of...

Jan1410 11:47 AM
Andy Resnick

8 
2,482 
i am now reading the book by goldstein on classical mechanics
classical mechanics is always a difficult subject for...

Jan1410 04:03 AM
wdlang

0 
746 
I've got a problem understanding a line of proof in my lecture notes.
Given that you have a charge of +Q and mass m...

Jan1410 06:59 AM
ian2012

4 
1,401 
Hello folks, this may be a very basic question, but if one has a very long electrical circuit, say about 10 light...

Jan1410 06:38 AM
Grimble

3 
660 
personally, I think glass would affect the measurement, as It should have Raman scattering.
please help me to...

Jan1410 08:54 AM
lionelwang

0 
908 
According to Sir Newton, F = ma
i.e if a body needs to be accelerated it requires some force basically.
or in...

Jan1410 02:50 PM
R Power

7 
1,220 