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

Apr2211 05:26 AM
ZapperZ

1 
47,662 
according to the 2nd law of thermodynamics, as time has increase, disorder universally is increasing among the...

Aug1007 12:24 PM
SpitfireAce

5 
2,962 
Dear reader,
can any on explain me what is a electromagnetic wave?????
benzun
please go easy with me

Oct603 02:01 PM
Integral

11 
4,806 
dear reader,
What are electrical waves? What are magnetic waves? What are electromagnetic waves?
what is...

Oct1603 11:33 AM
jimmy p

10 
3,269 
can someone please explain why when banking a curve at an angle so that no friction at all is needed to maintain the...

Feb2308 09:00 AM
rcgldr

2 
1,904 
I wonder if someone could explain what is meant by 'End Correction'
Any help is appriciated! thanks

May1505 08:45 AM
Doc Al

3 
4,029 
If there is a circuit consists of a long thin conducting shell of radius a and a parallel return
wire of radius b on...

Apr509 09:56 PM
Bob S

2 
2,407 
Jackson 2nd editon 6.2 and 3rd edition 5.26 are same questions but given solutions in problems are different. 2nd...

Apr509 04:39 PM
ber70

2 
1,429 
please lock thread. thank you.

Jul1507 12:59 PM
beramodk

0 
1,789 
A worker on the roof of a house drops her hammer which slides down the roof at constant speed of 4m/s. Th roof makes...

Feb1304 02:03 PM
Moose352

8 
2,419 
Hey 
I am a bike mechanic with a large interrest in physics. I know that a larger disc brake rotor provides a...

Jul514 12:16 PM
90245

20 
24,520 
Hello everyone:
I have heard about paint sprayers that put a charge on the paint as it exits the sprayer  the...

Jan2911 06:19 AM
bergsj

0 
1,500 
We know that the energy density of the electric field is:
\frac{1}{2}*\epsilon*E2
then, can we infer that the energy...

Jun309 09:56 PM
egust

34 
5,886 
Every book seems that it is a nobrainer that electric fields are zero in a conductor, but I do not understand this.
...

Jan2811 10:00 AM
Berko

6 
2,012 
On page 60 of his 3rd edition of Classical Electrodynamics, he discusses the method of images applied to a grounded...

Apr211 08:50 AM
Berko

6 
1,293 
Hello, everyone!
Any ideas how to measure drag or drag coefficient on a body of simple shape? We should conduct an...

Nov3011 11:39 AM
AlephZero

4 
4,271 
A large open tank, shown below, contains water at a height H. The water is allowed to flow out through a pipe whose...

Dec1411 05:39 AM
bermet

1 
1,988 
At parity of maximum resistance before failure (in the case of aluminum, deformation), weighs less aluminum or...

Aug913 10:01 PM
Aero51

4 
627 
Hi all, i have a doubt. How much teeth in relationship to his radius need to have a gear to be optimal? And, if i have...

Sep1813 09:57 AM
SteamKing

2 
359 
If newtons third law says there is an equal and opposite reaction how can there be energy transfer.
For example if I...

Apr3013 09:34 PM
SammyS

4 
1,432 
For example if I punch an object and it doesn't move, am I giving it energy, if so after doing that billions of times...

May113 05:16 PM
FireStorm000

3 
674 
We find in the literature the following relationships between electric field E and magnetic field B
B(z)=E(y)V/cc...

Jul1107 10:52 PM
bernhard.rothenstein

4 
23,349 
Consider please a conducting wire located in a plane electromagnetic wave propagating in the positive direction of the...

Jul1307 12:58 PM
bernhard.rothenstein

2 
1,724 
Defining the period measured by a moving observer relative to a stationary source as
T=t(n)t(n1) where t(n) and...

Aug3007 04:19 AM
bernhard.rothenstein

2 
3,269 
Consider please that an observer is located in a plane sinusoidal and polarized e.m. wave. He erects a metalic antenna...

Mar709 08:24 AM
clem

2 
977 
Consider the following statements:
1. If you move relative to me with velocity V I move relative to you with velocity...

Mar809 12:57 PM
bernhard.rothenstein

5 
931 
Many sources on basic gravity, like this quote from Wikipedia, say:
“In the case of a spherically symmetric mass...

Oct310 05:04 PM
Bernie G

16 
1,630 
This is problem from a text book whose solution I don't understand.
A small rock of mass 0.5kg is attached to a...

Jun1012 02:16 PM
BERNIE649

5 
1,536 
I have a basic question regarding black body cooling. Suppose a person at sea level on a clear night, were to use a...

Jul2007 08:33 PM
mgb_phys

8 
2,421 
Ok, so I have a 405nm laser pointer (bluish purple/uv). Had a few miscellaneous glass objects and was shining it...

Mar1114 02:37 PM
BernieM

15 
619 
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 
955 
Can we make a car or vehicle that can ride on the earths magnetic field here within the earths atmosphere?

Jun710 11:13 AM
bcrowell

1 
605 
Hi there!
I have a question, I am trying to find the critical point of a phase transition. For example in the Ising...

Nov1113 04:37 AM
Bersling

0 
334 
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 
2,359 
Where can I find online a good set of rigid body dynamics exercises? Thanks.

Jul1908 06:05 AM
Bert

2 
1,260 
This is a question which I have been been tossing around for some time. By looking at gravitationally induced...

Jan811 10:32 AM
hermitme

6 
5,203 
I'm designing a paddle wheel drive house boat and need to do some calculations to see if the parts I have on hand can...

Aug1909 03:32 PM
bertbcfm

0 
3,682 
I am attempting to design a base to support a post that will be pulled horizontally at its top.
A 2D image of the...

May312 05:12 PM
BertSmurf

7 
3,315 
Could someone show me the simple formula, showing how quickly
an item sinks in water.
Presumably the formula...

Jul1708 11:59 AM
bemortu

4 
3,132 
if i am finding the equipotential lines by using a conducting sheet, power supply, and muiltimeter to find the...

Sep2407 06:43 PM
Claude Bile

1 
3,578 
In 3D dynamics why is the angular momentum not aligned with angular velocity?
Does this mean H = Iw is wrong in 3D ?

Nov1405 02:11 PM
BobG

2 
2,385 