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

Apr2211 05:26 AM
ZapperZ

1 
47,882 
1) If we charge a stacked capacitor like the one in the picture and then remove the leads (red and blue) what will be...

Sep2211 04:53 PM
Philip Wood

3 
962 
while solving an exercise, i have found that they are considering the back emf of a motor constant although the...

Apr411 05:25 PM
epsilonjon

1 
962 
What is the physics of sharp turning; sharp curves and changing direction about those curves?

Sep1805 02:54 AM
Dr.Brain

3 
961 
http://www.badongo.com/pic/3538078
When this machine takes 0.2 moles of a one atomic ideal gas through this cycle,...

May1008 11:26 AM
kasse

0 
961 
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 
961 
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 
961 
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 
961 
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 
961 
Hi!!
WWhen i did the Bar graph experiment, i obtained a parabolic curve on negative and positive x axes
(time...

Apr2513 07:41 AM
GabrielMoon

4 
961 
What's the difference between cold moving air and hot moving air?
For instance, suppose you put two fans, of the...

Aug113 11:18 AM
russ_watters

11 
961 
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 
960 
Can anyone show me how to use impulse to solve any problem???

Dec1208 07:23 AM
Doc Al

3 
960 
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 
960 
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 
960 
since, B=curl(A), curl(E)= \partialB/\partialt
1)curl(E)= \partial/\partialt(curl(A))
2)curl(...

Dec311 12:20 PM
sk2nightfire

0 
960 
Hello,
This is kind of a simple question but if an EM wave is propagating in the positive x direction and the E field...

Dec1611 08:59 PM
Simon Bridge

1 
960 
Lets suppose that we setup two instances involving two masses m1 and m2.
m1 > m2
Case 1. The two bodies are...

Feb1012 12:33 PM
IsometricPion

3 
960 
Hi,
There are probably hundreds of books explaining (mathematically!!) how a directional coupler works....

Feb2912 03:16 AM
kaps_nit

0 
960 
Why is the parabola the most bent, concave, effective mirror?
What are some properties of a third order mirror...

May2112 05:35 AM
xlearsi31

2 
960 
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 
960 
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 
960 
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 
959 
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 
959 
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 
959 
http://www.grc.nasa.gov/WWW/BGH/reynolds.html
(Reynolds Number)=(Inertial Forces)/(Viscous Forces)
My question...

Sep810 03:45 PM
luckis11

6 
959 
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 
959 
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 
959 
A positron and an electron are simultaneously fired from paralle particle accelerators a distance d apart, with equal...

Feb712 06:19 AM
clem

2 
959 
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 
959 
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 
959 
hi
im really confused about the exact heat transfer mechanism of the phenomenon i observed
the situations simple:...

Mar2112 03:00 PM
uniqueboy

0 
959 
I have a question that involves two electric dipoles that are situated at the origin and are perpendicular to each...

May1912 12:11 PM
neebah

0 
959 
What properties of an inductor change in a low temperature environment. Specifically in the 100 through 70 degrees...

Jul1112 06:31 PM
berkeman

1 
959 
http://www.youtube.com/watch?v=E185G_JBd7U
At 37:00 he charges a conductor with a dielectric inside, removes the...

Feb1713 03:58 AM
vanhees71

4 
959 
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 
959 
Sorry if the formulation is imprecise, I'm a biology major trying to study some physics. The question is:
So far,...

Jun2713 07:39 AM
boneh3ad

3 
959 
Edit: Apparently Coulomb's law only holds for electrostatics... in that case I understand that this problem is...

Feb1710 07:12 PM
torquil

1 
958 
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 
958 
So I'm just reading through a high school Physics text, essentially, and I have these four general question as I learn...

Jul2612 07:46 PM
DaleSpam

1 
958 
I've theoretically proved that heat to work can be converted at 100% efficiency by proposing a system, named as the...

May313 06:59 AM
Vanadium 50

7 
958 