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

Apr2211 05:26 AM
ZapperZ

1 
47,797 
So for my textbook says that for the potential energy of two point charges to be zero (U=0), there must be an infinite...

Feb509 05:17 PM
Seraph404

0 
959 
I'm learning vectors. I read somewhere that if a vectors magnitude is constant, then its derivative is perpendicular....

Jan514 10:51 PM
Simon Bridge

11 
959 
Two spheres collide and assume that the collision is perfectly elastic. Also only linear momentum.
I have the...

Aug3104 10:36 PM
nullspace7

2 
958 
Greetings
I've been reading about these magnets such as these:
http://www.lanl.gov/orgs/mpa/nhmfl/magnets.shtml
...

Nov1108 10:14 AM
Enthalpy

1 
958 
Considering:
1. Sir Arthur Eddington once said:
"If someone points out to you that your pet theory of the...

Jan1309 06:05 AM
intervoxel

0 
958 
Hope iposted this question in the right spot!!!!.
If i launched something in space and then stopped its forward...

Apr210 12:37 PM
LURCH

7 
958 
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 
958 
I think we can't have a negative displacement. Is that right?
Acceleration: the change in displacement / change in...

Mar212 06:17 AM
Doc Al

4 
958 
If we place an infinite conducting sheet in free space, and fix its potential to \varphi_0, how do we solve solve for...

Mar3012 03:40 PM
chrisbaird

1 
958 
Hi everyone, I have a very simple and classic question here.
Suppose I have a 10cm,0.01kg ruler (uniform density)...

Aug2412 06:00 AM
andrien

2 
958 
From what I have read so far, the vapor pressure of a liquid is temperature dependent while it is independent of the...

Oct3012 08:24 AM
mfb

1 
958 
Hi! :)
I'm trying to calculate the appropriate lenses to use for a project. I need to magnify a 50mm by 50mm...

Dec2912 11:43 PM
kingkahuka

1 
958 
I'm working on a project for myself in regards to atmospheric reentry. I've come across some equations that describe...

Apr914 08:41 PM
Rd123

11 
958 
Hi, I just need to ventilate and see your opinions.
Charge can be partitioned into groups of particles of one or...

Oct2613 04:29 PM
DaleSpam

11 
958 
I wasnt able to find anything on the internet, so maybe someone else can help. I need to know the coeifficient of...

Mar608 01:40 PM
spri4

3 
957 
Consider a wire, if I suddenly pass current on it. There would be an instant localized B field around the wire. Since...

Apr408 07:58 PM
enroger

4 
957 
Can anyone show me how to use impulse to solve any problem???

Dec1208 07:23 AM
Doc Al

3 
957 
Can anybody help me that how to work out the direction of Lorentz Force? Should I work out from the formula? Thanks.

Sep1510 12:34 AM
Born2bwire

2 
957 
Hello
I'm new to this forum and i was wondering if anyone here can help me with a problem i'm having.
I am...

Apr1711 01:35 PM
rcgldr

2 
957 
Hello! I'm reading up on Hamiltonian mechanics and i stumbled on the fact that the curl of the vector potential can be...

Jan512 10:52 PM
netheril96

1 
957 
Hey, i have a Thermo exam tomorrow, and i've been working through the textbook examples and problems, and i was...

Feb1912 10:00 PM
PhysicsGod

1 
957 
I just read that Centrifugal Force is a false force. It does not exist. Inertia (which is not a force) is mistakenly...

Mar1212 05:59 AM
tinytim

2 
957 
hi
im really confused about the exact heat transfer mechanism of the phenomenon i observed
the situations simple:...

Mar2112 03:00 PM
uniqueboy

0 
957 
Hi,
I have a quick question: Let's say I have a Lagrangian \mathcal{L} . From Hamilton's principle I find a...

May2212 05:32 PM
Vargo

3 
957 
What properties of an inductor change in a low temperature environment. Specifically in the 100 through 70 degrees...

Jul1112 06:31 PM
berkeman

1 
957 
I only know that a pure gas at same reduced temperature and reduced pressure will have same compressibility factor....

Nov1312 11:23 PM
Outrageous

0 
957 
I am a hobbyist and I have designed a radial turbine device for use in a tidal stream. I have conducted a couple of...

Feb2613 06:19 PM
Chuck 65

0 
957 
As charge moves around a circuit, their energy increases by each loop.
However, I just heard somebody say the total...

May2813 12:57 PM
DaleSpam

11 
957 
Second law of thermodynamics states that heat does not flow spontaneously from cold to hot bodies. But a cool...

May1413 10:58 AM
Andrew Mason

8 
956 
When we say heat released in a circuit is i^2 RT , who/what is the cause of this energy loss; is it the battery...

Jan1909 04:16 PM
Dadface

1 
956 
so that the Kelvin's theorem applies?

Dec2509 09:00 PM
wdlang

0 
956 
Suppose I have N ideal particles in an enclosure, be it a ball or a cube or some other form. The particles shall...

Oct2910 03:24 PM
dgOnPhys

5 
956 
You have one slit which it is sent light through and in one point at a screen they measure the intensity with adding...

Nov2410 07:58 AM
georg gill

0 
956 
I have an engineering problem that I have to solve.
Imagine that we have two electron beams, one originates from a...

Jan1811 06:37 PM
Vanadium 50

3 
956 
Let's suppose one wanted to move a wheeled, landbased vehicle. Generally, which would be more efficient, and why?...

Aug2211 03:33 AM
sophiecentaur

2 
956 
I quote from Oliver Heaviside, "Electromagnetic Theory", 1893, p.15:
It was discovered by mathematical reasoning...

Nov2511 10:50 AM
gsal

1 
956 
Hi, all
Would you guys recommend some books on the subject of nonlinear physics?
And how is the recent progress...

Jan212 10:22 AM
Filip Larsen

6 
956 
For a horizontal spring mass system is the frictional force considered negative (μmg)? i guess it will be negative;...

Apr2212 12:16 PM
sphyics

4 
956 
Hi, I'm very new here, 10min old, but the problem with my knowledge, or better, lack there of, at this time is very...

Dec212 04:27 AM
juvan

0 
956 
I know and fully understand the mathematical definition of it. But what's the physical explanation? Is it something...

May713 03:22 PM
Jano L.

6 
956 