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

Apr2211 05:26 AM
ZapperZ

1 
46,866 
Why are light waves/Xrays/gamma rays/etc. in the form of sine waves, rather than, say, a zig zag wave, or even a...

Feb910 03:58 AM
bjacoby

23 
8,428 
The noise power in a conductor is given by
P = k.t.B
Does this mean the noise power is independant of the...

Feb810 02:29 AM
Born2bwire

6 
1,495 
Hello,
This should be a straight one for most of you. Given a cantilevered beam that has a force F applied across...

Feb910 08:36 PM
Mapes

9 
7,862 
How to make a hair which is still properly rooted to skin (any hair, not just on head) become very thin at the end?...

Feb610 04:29 PM
SAZAR

7 
2,119 
Incidentally in another thread I made this reasoning to calculate the velocity increase in an elastic collision:
...

Feb810 04:47 PM
Saw

8 
3,224 
hi everyone i want a real explanation to maxwell equations and exactely a meaning physicly to dérivation to an...

Feb910 02:58 AM
bjacoby

6 
3,288 
does electrons fall out when a current carrying wire is cut
well i know it doesnt make much sense n also doesnt...

Feb710 04:53 AM
champ_9999

6 
1,222 
The medieval trebuchet is a missilethrowing device, with a heavy counterweight on the short end of a beam that pivots...

Feb810 05:11 PM
turin

15 
4,006 
Does gravity affect the way magnets interact with one another? Would the same magnet be stronger in a low...

Feb1010 09:45 PM
LouieHussey

1 
1,100 
Hi,
I'm trying to investigate how the force exerted onto a human body is affected by the presence of a surrounding...

Feb810 11:48 AM
sophiecentaur

8 
1,727 
Hi,
i thought a while about the meaning of the following expression
\delta t \, \cdot \, \mathrm{div} \, \vec...

Feb1010 10:55 AM
saunderson

1 
1,127 
I have been wondering why we take work done on the system +ve in chemistry while ve in physics. Similar difference...

Feb610 05:39 PM
0xDEADBEEF

1 
1,845 
Why can only the angular momentum of a rigid body rotating about an axis of symmetry be expressed as the product of...

Feb610 09:11 PM
cesiumfrog

3 
935 
Hi!
Work is defined as
dW = F\cdot dr
so there is no work required to keep things spatially fixed in a...

Feb610 06:59 AM
FredMadison

10 
1,002 
Can someone help me and tell me where does the equation of enthalpy as function of reduced Gibbs energy and...

Feb610 03:22 PM
kthouz

0 
1,612 
Right, so I've just created my FrankenEquation and it hungers for brains, as well as acceptance. Unfortunately for my...

Feb610 02:41 PM
diazona

1 
1,188 
Temperature of gas is due to kinetic energy of molecule & pressure is due to molecule collide to container wall with...

Feb710 10:47 PM
morrobay

11 
3,190 
Placing a block of metal in a solution of its ions causes it to go into some kind of dynamic equilibrium such that the...

Feb710 11:24 AM
Repainted

0 
2,299 
\Delta_{r}

Feb610 03:07 PM
kthouz

0 
832 
Assume you have two parallel plates with charges +q and q.
Now, you fill the space in between with two different...

Feb710 12:39 PM
kcdodd

3 
944 
Learning electrodynamics here, and the book I'm reading says the following: "By definition, one coulomb of electric...

Feb810 10:28 AM
diagopod

2 
1,892 
Grounding is used for dircharging..
In case of charging by conduction,let a sphere having excess negative charge is...

Feb710 05:33 PM
Shahid0072

6 
1,166 
What's a good definition (or a practical definition) of this?
It's actually with regards to electrodynamics but I...

Feb710 05:50 PM
nicksauce

1 
1,250 
I understandthat moving charged particles can be made to rotate in a magnetic feild, but what happens when the induced...

Feb810 01:09 PM
sophiecentaur

4 
1,210 
Hello all,
I have recently been taught the method of imagging with opposite point charges. The stereotypical...

Feb810 03:18 AM
torquil

2 
583 
Hi, in questions involving lenses, when using the "thin lens formulae"
if my di is negative doesnt that mean the...

Feb810 06:33 AM
tinytim

1 
584 
I'm learning that in the electrodynamics of circuits and charges, an Efield is very different from a Bfield. But in...

Feb910 11:06 AM
diagopod

12 
3,493 
The electric flux through a closed surface is the integral of the dot product E.da. Suppose we have a point charge at...

Feb910 05:35 AM
tinytim

7 
826 
The circulation of a vector field is the closed line integral of the dot product between the vector and the...

Feb1010 09:02 PM
LucasGB

12 
1,375 
Is this something I just have to accept? How can there be no loss of energy/heat when I've always been taught...

Feb1010 12:16 AM
mordechai9

5 
1,014 
I need to find the charge and charge density on the surface of a conducting sphere of radius r=0.15m and of a...

Feb910 01:13 AM
Vanadium 50

1 
1,568 
In this thread mgb listed massless springs and friction free slopes. That made me think  what other idealized...

Feb910 04:57 AM
Stonebridge

1 
663 
Sphere A corries a net positive charge, and sphere B is nuetral. They are placed near each other on an insulated...

Feb1010 07:00 PM
clem

1 
625 
Situation: a car moving quickly down the road with a window open.
Car reference frame: the air outside is moving,...

Feb910 09:10 AM
rcgldr

1 
824 
I am struggling to grasp the concept of the electric field between two opposite charges. I know that the field is...

Feb910 10:35 AM
Repainted

1 
1,909 
A meter stick is hung at its center from a thin wire. It is twisted and oscillates with a period of 5.9 . The meter...

Feb910 01:48 PM
ali_raghy

0 
914 
Is there any relation of gravity with centrifugal force & gyroscopic effect?
Rotating body shows centrifugal force...

Feb1010 12:52 AM
russ_watters

1 
2,952 
The magnetic field of a steady current in a loop is given by the Biot and savart integral which is
1/4pi Integral =...

Feb1010 06:28 PM
wofsy

3 
766 
I am wondering how one would construct the grand partition function of a composite system of solid and gas with the...

Feb1010 08:04 PM
univox360

0 
1,240 
I don't remember learning this in my C Physics Mechanics class which is odd since it seems pretty important. In the...

Feb1110 04:22 AM
tinytim

1 
4,132 