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

Apr2211 05:26 AM
ZapperZ

1 
46,790 
on the corridor floor the static friction is 2.2N, the dynamic friction is 1.4N
when the corridor floor with water...

Mar1908 05:32 AM
TVP45

10 
2,845 
Hi everyone im very new here so please don' be too harsh with me :shy: I hope I posted this in the right section. If...

Mar1908 03:20 AM
kamerling

4 
1,444 
I'm just sort of looking for some clarification on some of this...
1) Say we have an ideal emf (battery, I...

Mar1908 02:12 AM
mikelepore

4 
1,465 
I have a question about the deduction of First Thermodynamic Law. The book that I have is written by Paul A. Tipler...

Mar1808 04:59 PM
Mapes

3 
3,626 
I am trying to determine the speed of one vehicle involved in an accident. I know the speed of the other vehicle, and...

Mar1808 09:33 AM
Danger

13 
1,951 
Dear all
When I first learned about forces and motion I was taught F=ma in terms of apply a force to a mass and the...

Mar1808 06:43 AM
DaleSpam

50 
5,793 
I got into a discussion about heat sink materials and was beaten up for suggesting that Aluminum is better than Copper...

Mar1708 09:15 PM
Steve_

11 
2,838 
Using a Laze light and curtain far from it 50 m. It is supposed that A is a light centre when having no aberration...

Mar1708 06:06 AM
einsteinooo

4 
1,024 
It is clear that stronger or faster the wind, the more force it exerts on, let say, a house or anything. So, can we...

Mar1708 05:21 AM
hadel

0 
6,422 
This is a followup to the old thread What are the FULL classical electrodynamic equations? which never really provided...

Mar1708 04:49 AM
pellman

7 
2,326 
i was just stumbling across an accelerator patent that is 20 years from the filing date.
linear accelerator / psw /...

Mar1608 09:19 PM
klystronman

0 
1,109 
I've got a great good head for intuiting physics but no post2ndary math.
How fast must a cylindrical space station...

Mar1608 09:02 PM
wysard

61 
8,459 
Can anyone show me the calculus proof of the forces of gravity canceling out inside of a shell of mass? I couldn't...

Mar1608 07:06 PM
woodne

0 
2,172 
For my physics practical coursework I investigated how the rate of revolution of the permanent magnet in an...

Mar1608 06:31 AM
jamhar89

2 
2,851 
Hi, I'm working on some simple aerodynamics for a game. Are there any generic, but fairly accurate, formulas for...

Mar1508 11:59 PM
pantaz

4 
8,306 
hi m a new member here....actually i m in a great confusion....plz solve dis confusion fer me...its related to...

Mar1508 11:41 AM
cristo

13 
1,645 
Hello everybody!
I have a large set of items and, twobytwo, there exists some kind of attraction/repulsion that I...

Mar1508 11:02 AM
jtbell

3 
900 
As part of a local competition, i have to calculate the distance that a projectile launched at an angle from a certain...

Mar1508 09:06 AM
naes213

3 
889 
Okay, so the situation is a hydroelectric plant, assumed to have a vertical inlet pipe, of (s) metres high, and a...

Mar1508 06:57 AM
rcgldr

14 
11,939 
Why dont metal objects such as a nail get charged by friction like the famous comb, plastic rod or glass rod  all...

Mar1508 06:29 AM
pam

4 
3,333 
what's the force acting during stapling?

Mar1508 01:53 AM
cryptica

0 
1,047 
Hey I was just wondering what the differences between the three forms of mechanics were. I've only studied basic...

Mar1508 12:53 AM
Feldoh

4 
4,161 
Why don't we call B magnetic field strength like we call E, the electrical counterpart. In stead we call it magnetic...

Mar1408 11:19 PM
nandan

4 
1,010 
Hello. I have what I hope to be a simple question. It's something that I've come across in several problems in my...

Mar1408 07:32 AM
AussieDave

4 
3,490 
I am working on using a Runge Kutta 4th order code (in the C programming language) to predict a Keplerian orbit in 2...

Mar1308 06:17 PM
D H

3 
6,992 
I'm not sure this is the right place to post this question but here goes:
In feynman vol.1 399 there is a...

Mar1308 12:30 PM
jbunten

2 
3,520 
Greetings,
Can you recommend a web site or sites that has worked examples and discussion of harmonic motion with 2+...

Mar1308 11:10 AM
SeniorTotor

1 
1,185 
L.D.Landau's book <Mechanics> first page have below word:
if all the coordinates and velocities are simultneously...

Mar1308 10:54 AM
SeniorTotor

13 
3,013 
I don't understand how walking 10 feet forward and then 10 feet back means you did zero work. If I pull a 1 pound...

Mar1308 09:06 AM
stewartcs

13 
1,502 
Sorry if I'm posting in the wrong place.
I am a High School Physics teacher in Christchurch, New Zealand.
I recently...

Mar1308 07:49 AM
Andy Resnick

2 
1,357 
What is the exact definition for momentum other than the formula p=m.v? Is there a way to understand it as a real...

Mar1308 07:38 AM
SeniorTotor

6 
1,288 
In my little area of recent research, the Green's tensor is the relationship between a point force and the resulting...

Mar1308 07:33 AM
SeniorTotor

2 
7,112 
I am just playing around with physics simulation in c++... and my latest obsession is simulating rigid body motion...

Mar1308 05:13 AM
pkleinod

3 
1,932 
Hello!
1 MW can be transmitted , for example, in 2 ways:
1MW=100V*10000A;
or
1MW=10000V*100A.
In the...

Mar1308 03:20 AM
SciencePF

7 
1,626 
Hi!
I'd like to know if there is some way of computing or deriving the energy stored in a metallic object subject...

Mar1208 05:26 PM
rsr_life

5 
1,876 
Dear all,
Intuitively, the probability of finding a trapped particle at a given location x should be proportional...

Mar1208 05:56 AM
pkleinod

7 
1,775 
In the definiton of magnetic lines of force, we talk about one unit north pole. Why? Path is independent of the pole...

Mar1208 05:02 AM
manjuvenamma

0 
1,225 
Hi I read that in an encyclopedia but I don't understand it.
"Because the surface of the material is now...

Mar1208 04:36 AM
tinytim

5 
1,529 
Why can't I use Ampere's law to compute the magnetic field at the center (P) of a semicircular wire?
If I...

Mar1108 03:03 PM
mgrantbaker

7 
2,384 
Hi everybody!
I have a big question for you, I have been staring me blind on this problem I got.
And wonder if...

Mar1108 04:24 AM
Ploppen

0 
752 