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

Apr2211 05:26 AM
ZapperZ

1 
45,834 
When people talk about sunspots and the solar cycle and stuff like that, they often mention magnetic field lines...

Oct1212 05:16 AM
Qreeus

3 
966 
I was wondering, after discovering that in particular scenarios atoms can release photons, how they do it? Is some of...

Oct1212 04:26 AM
Drakkith

6 
1,210 
I am very confused with a particular aspect of part of my physics curriculum.
Let's say there is an object swinging...

Oct1212 02:46 AM
Simon Bridge

1 
1,263 
I was wondering that since most forms of energy can either be in wave or particle form, (example; photons and...

Oct1212 12:26 AM
Drakkith

5 
1,041 
entropy = jouls/kelvin
supose 1 liter of ideal gas is allowed to freely expand into a 2 liter volume in an isolated...

Oct1212 12:11 AM
Andrew Mason

1 
907 
Will any one help me to understand the concept of reduced mass , where does it come from and its physical significance

Oct1112 08:42 PM
Simon Bridge

4 
860 
I was reading a book on wave and found that when they derive the equation of shm from the equation force varies with...

Oct1112 08:10 PM
Shan K

7 
970 
If an isolated body starts to accelerate, why would saying the system isn't properly isolated render Newton's second...

Oct1112 07:55 PM
autodidude

2 
618 
I am a bit confused about gravitational potential energy near the earth, namely the formula given by mgh.
I know...

Oct1112 06:52 PM
Simon Bridge

17 
1,373 
I was wondering if my measurements book that states there are 9,460,000 km in a lightyear is correct. I raise this...

Oct1112 06:46 PM
Drakkith

7 
773 
http://www.icarusengineering.com/DynamicSoaringandSE.htm
http://www.youtube.com/watch?v=wHPjxf4q91Q
I am...

Oct1112 03:23 PM
A.T.

23 
2,742 
In Jackson Classical Electrodynamics (P. 498)
Eqs 10.130 and 10.132, which describes waves from a conducting sphere...

Oct1112 01:47 PM
rays

0 
535 
Walter Lewin at MIT says that at a point of stable potential energy(like the troughs of a wavy surface), d^2u/dx^2...

Oct1112 12:53 PM
CrazyNeutrino

0 
370 
Hey guys,
I am trying to conceptualize as to why shear stress in a vessel is highest at the wall of the vessel and...

Oct1112 12:47 PM
Chestermiller

7 
1,061 
If the wheels and tires of a car are rolling without slipping or sliding when turning, the bottom of the tire is rest...

Oct1112 11:21 AM
A.T.

7 
1,428 
this is written in wiki:
"There are different explanations for the effect and there is debate on which explanation is...

Oct1112 10:20 AM
nickisverygoo

0 
451 
What would be the pattern of electric field lines 'inside' a solid charged sphere..?

Oct1112 10:15 AM
prakharj

2 
499 
I was wondering what the difference in the magnetic poles north and south is and what makes them unique.

Oct1112 08:45 AM
Qreeus

3 
516 
Hello..
The query is regarding thermal conduction of heat from a solid body:
Suppose we have a long metallic rod...

Oct1112 06:51 AM
Chestermiller

6 
901 
Can someone prove that the change in potential energy is negative work.
I have a very basic understanding of the...

Oct1112 06:11 AM
CrazyNeutrino

6 
751 
How to find the work done by a force in (two dimension)
When
F = ax^2 i + b x^3 j
If a subject move from...

Oct1012 11:40 PM
nasu

4 
1,616 
I recently had a problem set with two questions that seemed to give very similar answers. I'm not asking how to do...

Oct1012 08:56 PM
NullSpace0

1 
558 
Will any one give me the derivations for continuty equation of fluid and euler's equation of fluid motion .

Oct1012 05:45 PM
Studiot

6 
799 
Hi,
I searched the forum and the web and can't seem to find my answer, nevertheless I will continue looking.
...

Oct1012 04:08 PM
KleZMeR

7 
1,553 
If you push an air filled ball down to the bottom of a bucket of water an acceleration is caused by the buoyant force...

Oct1012 02:42 PM
jbriggs444

26 
2,411 
Using taylor series expansion to prove gravitational potential energy equation, GMm/r=mgh at distances close to the...

Oct1012 01:16 PM
Nugatory

8 
3,193 
are derived in my book from the assumption that a wire can be cut into a lot of infinitesimal wires with a capacitance...

Oct1012 12:57 PM
aaaa202

2 
765 
My first post so please forgive me if I am already breaking some rules ;)
This may apply to positive or negative...

Oct1012 12:20 PM
CrazyNeutrino

9 
1,168 
Can anyone tell me how to measure the viscous constant (C1) and the pressure constant (C2) for different substances in...

Oct1012 12:00 PM
CrazyNeutrino

0 
681 
I asked a question on this forum a few days ago about the entropy change of the surroundings, and am grateful for the...

Oct1012 10:13 AM
Andrew Mason

49 
3,343 
Why cant two field lines intersect? The answer that i have often heard is that if they were to intersect, then there...

Oct1012 07:12 AM
mikeph

13 
2,177 
I bought a compass today. I tested it at the store, multiple times, spinning all which ways. It would always...

Oct1012 06:55 AM
Borek

7 
1,158 
Hi,
I would like to calculate the sum of momentum in the blue volume. See drawing. The blue volume is full of...

Oct1012 03:50 AM
Gh778

17 
1,292 
Hi all,
I've been trying to understand the vibration of a cantilever beam subjected to a forcing function using...

Oct912 11:54 PM
boeing_737

0 
379 
in a battery, when all the electrons have transferred to the positive terminal ( i mean both terminals have same no....

Oct912 05:14 PM
Studiot

3 
795 
Hello!
I've been doing some excercises in mechanics and stopped for a moment over the thing that sometimes bothers...

Oct912 05:08 PM
mfb

1 
498 
I am studying the resistivity of various materials in my physics class and I have a query regarding conductive fluids....

Oct912 05:07 PM
Studiot

2 
482 
I have a question to depth understanding electricity
what's the thing that make electrical power appear???
I...

Oct912 04:19 PM
Naty1

5 
542 
Hi,
I'm trying to clear up a confusing point in the book by José and Saletan, concerning equivalent Lagrangians (in...

Oct912 12:49 PM
vanhees71

4 
887 
My book has introduced the idea of gauge invariance in terms of classical electrodynamics (attached file). However, I...

Oct912 12:38 PM
vanhees71

6 
1,222 