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

Apr2211 05:26 AM
ZapperZ

1 
48,237 
There is a rod treating as rigid body, the rod which mass is m and lenghth is R rotate about one end of itself with...

Aug2709 03:56 PM
redoxes

11 
1,028 
I thought of what seems to be a very classical problem but I can't find a solution for it.
At t=0 you have a sphere...

Aug2709 03:54 PM
PhaseShifter

1 
752 
Hi and thanks in advance for any help with this problem.
If I have a very very well insulated tank of water of say...

Aug2709 09:15 AM
stoody

4 
5,984 
i was reading the book of Griffin  introduction to electrodynamics. it is written that the force of charge q on Q is...

Aug2709 07:53 AM
jtbell

7 
1,119 
Like a radioactive particle emit rays, does this similar to the field lines of a charged particle?
at what speed...

Aug2709 07:22 AM
DaleSpam

8 
775 
While reading a very interesting article/lecture called Life at Low Reynolds Number, there was a reference to a...

Aug2709 01:12 AM
Vanadium 50

2 
1,159 
Hi guys, I'm going through Reif's book on statistical mechanics and have a question on the parameter omega, the number...

Aug2609 11:30 AM
Sam_Goldberg

2 
5,439 
Waht is the work done by friction when a man is walking? zero or nonzero?
I was analysing the work done by...

Aug2609 11:10 AM
vin300

21 
2,965 
I have heard many times that the positive "inductive" part of a circuit's reactive power is equal to "L i di/dt".
I...

Aug2609 02:14 AM
bjacoby

1 
11,436 
RE: Ocean Waves:
1. Linear Wave Formula  What is the average sea state that is capable of producing a 20 ft. wave?...

Aug2509 12:45 PM
Governor

12 
1,363 
Say I want to put a bottle of water in the microwave and heat it up. How do I determine the pressure in the bottle as...

Aug2509 09:48 AM
Lok

7 
2,332 
The total energy of a pendulum is calculated either by it's maximum height (Gravitational Potential), or by the lowest...

Aug2409 02:52 PM
DaleSpam

21 
4,511 
I need a couple of formulas to determine the live and dead load on a stretched cable for a zip line. They are:
1....

Aug2409 12:40 PM
Marcpost

0 
4,332 
Do only electrons emit a photon when accelerated in EM field? Do protons, for example, radiate?

Aug2409 12:30 PM
Bob S

3 
1,645 
Hi,
I'm looking for a little bit of help in this matter, I'm trying to put up a general formula of the internal...

Aug2409 04:11 AM
TriKri

9 
4,887 
I'll explain the problem.
\cdots \cdots \cdots \cdots
\cdots \cdots \ldots===========
\cdots \cdots ...

Aug2409 02:05 AM
WiFO215

2 
605 
Hello
Suppose that I insert a thinneedle thermometer into a porous material (such as snow) that consists of air,...

Aug2309 11:05 PM
nkinar

6 
1,129 
I'm reading the book "Electricity and Magnetism: Vol. II" by Edward M. Purcell, in which he describes Gauss' law as...

Aug2309 10:10 PM
Born2bwire

3 
1,085 
I've learned that the electrostatic force is about 10^{39} times greater than the gravitational force.
I guess the...

Aug2309 11:35 AM
Naty1

15 
1,373 
Hi,
Is it possible to have a magnetic field B which has curl B = 0 in all space?
intuitivly such a field will be...

Aug2309 02:08 AM
naftali

4 
5,256 
I was unfortunate enough to have sports on the days of my mechanics classes so I've basically missed most if not all...

Aug2209 11:52 PM
Mentallic

3 
824 
Hey guys,
I have the following (nonhomework) problem:
I am simulating a collection of normally distributed...

Aug2209 08:37 PM
creepypasta13

1 
752 
I am trying to work out the physics used in a microcontroller project. I am having problems with even simple...

Aug2209 12:43 PM
sganesh88

2 
863 
Hi guys, I am reading Reif's book on statistical mechanics and have a question on the H theorem. In section 2.3, Reif...

Aug2209 12:39 PM
Sam_Goldberg

10 
1,903 
Or how did Coulomb measure quantity of electricity while doing his experiments that leads him to claim his famous...

Aug2209 11:39 AM
Bob S

4 
1,470 
Hi, I'm not sure this falls under the homework category, but I posted this here because I think this is more of an...

Aug2209 11:14 AM
jfierro

5 
2,711 
if a system is made of 3 atoms with no degeneracy with energy levels of fro example 0, e, 2e
would it be safe to...

Aug2209 08:58 AM
Count Iblis

4 
711 
Is it true that partition function for canonical ensemble is
Z=\sum_{\{states j\}}e^{\beta E_j}=e^{\beta F}
...

Aug2209 08:49 AM
Count Iblis

9 
1,339 
My question is what causes death wobble? Let me explain more...
The vehicle I've experienced this on is a Jeep with...

Aug2209 04:03 AM
rcgldr

19 
16,287 
A classic problem in freshman electrodynamics is as follows: We have a capacitor (capacitance C1) charged up w/ charge...

Aug2109 09:22 PM
Bob S

4 
1,142 
Hello Everyone,
Recently, I was trying to explain the fundamentals of thermal radiation to a nonengineer and I...

Aug2109 02:03 PM
CFDFEAGURU

2 
890 
Is there an other liquid that was similar water(In Convection current) but without the conductivity of it?

Aug2109 12:14 PM
sampro

17 
4,591 
Here is an invention I'd like to share with anyone who has the money to develop and market it. Furthermore, I don't...

Aug2109 09:18 AM
russ_watters

1 
625 
Let us consider a wheel which rotates about an axle thorugh its center with an angular velociy \omega0. After sometime...

Aug2109 07:17 AM
Amar.alchemy

2 
1,813 
This is my first post so I hope I'm putting it in the right section :redface:
I searched for similar questions but...

Aug2109 02:34 AM
stevebd1

5 
1,253 
A steam engine stove produces, say, 10 units of warmth, the second law states that not all warmth can be converted...

Aug2009 02:55 PM
Mapes

6 
1,686 
I was curious about how exactly energy was transferred in electrical circuits because all my texts were inadequate....

Aug2009 10:23 AM
cak942

3 
1,338 
I need to find a means to calculate the load on three or four ropes that are supporting a weight between them. These...

Aug2009 06:53 AM
DaleSpam

9 
4,067 
In what kind of instances would the quantity of impulse be used? My text book says that it's when very large forces...

Aug2009 03:37 AM
mahela007

4 
774 
I was studying avometer, and came across this paragraph which I find confusing: "The voltage measuring part of the...

Aug2009 02:51 AM
Darryl

1 
1,298 