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

Apr2211 05:26 AM
ZapperZ

1 
46,957 
Dear topic mates!
I'm an electric engineer and physicist student from Hungary.
I looking for description of the...

Mar2509 02:48 AM
mind

5 
3,309 
Hello there. I'm currently dead beat on this problem, maybe because I'm not sure I quite understand what it's asking...

May804 01:49 AM
Theelectricchild

2 
2,992 
Hi. I'm trying to make a small simulation of several simple physical systems (C++). I have the differential equation...

Jul1712 06:42 AM
RooccoXXI

1 
1,067 
I thought of this question the other day, and I was unable to solve it. A Google search has not helped, so I thought...

Jan313 06:11 PM
tinytim

3 
769 
Hello, everyone!
I'm working on parametrizing a magnetic field using spherical harmonics. The equations
Yc n,m...

Jul1609 11:20 AM
Dzyubak

2 
2,038 
Hi,
I need expand a spherical function(real function not a complex function) in terms of spherical harmonics....

Feb1511 07:34 AM
DrDu

1 
1,823 
imagine there is a spherical glass object with index of refraction N
is that possible that for some N and angle of...

Nov1505 11:09 AM
jtbell

2 
1,289 
My understanding is that the EM field at r.t generated by a radiating source can be described as the amplitude of...

Apr2811 09:36 PM
vanhees71

13 
1,403 
On May 25, 2011, the journal Nature published an article stating that the electron was experimentally found to be...

Jun111 05:58 PM
RedX

2 
1,097 
I'm trying to find the line element in spherical coordinates as well as a velocity element. I know that they are...

Sep304 10:45 AM
robphy

2 
2,196 
There is a spherical capacitor with inner and outer radii of a and b respectively,has a dielectric material of small...

Feb714 09:31 AM
Shyan

0 
264 
Show that the energy associated with a conducting sphere of radius R and charge Q surrounded by a vacuum is
U =...

Jul2004 03:49 PM
turin

2 
4,826 
Hi, I'm trying to find the formula for the moment of inertia of a spherical cap relative to the axis perpendicular to...

Jun1505 01:08 PM
André Verhecken

6 
4,587 
I want to find ##\Phi## and ##\vec{E}## for the general case of a Spherical Ball with uniform Charge Density centered...

Nov1213 08:40 PM
Astrum

3 
464 
hi everybody,
i would appreciate it if someone could clarify the concept of spherical aberrations in the context of...

May2811 12:03 PM
Andy Resnick

3 
2,051 
Consider a sphere and a semicircle with radii r and R respectively.(R>>r)
The sphere has mass m.Imagine we place it...

Jul612 01:06 PM
DaleSpam

2 
709 
I've seen a number of posts on the following question, but don't believe any contain a solution to the following very...

Apr1010 01:52 PM
Gerenuk

1 
2,164 
Greetings,
i have the following question:
a sphere with the polarization density of P vector (constant) and...

Nov308 03:16 PM
Zipi

0 
936 
Imagine you put a sphere on a track which is part of a vertical circle.You expect the sphere to roll in a path like a...

Oct2911 01:52 AM
Shyan

8 
1,167 
Is there any way to prove that speeding up before a hill in a car will save you gas compared to maintaining your speed...

Nov1608 07:32 PM
f8pc

14 
1,868 
Hi all.
I've been thinking of how one can measure the speed (& indirectly velocity, since we know it's direction of...

Jul812 03:00 AM
Simon Bridge

7 
1,134 
Using a Newton equation for position and substituting (vv0)/a for t you can get the following formula:
v^2=...

Apr2605 01:39 PM
Doc Al

3 
5,240 
I understand the basics of speed and velocity, but I got a rather backhanded question on a recent test that I believe...

Oct1111 11:13 PM
cepheid

3 
2,736 
Can an object be increasing in speed as its acceleration decreases? if so, give an example; if not explain why.

Mar2011 03:07 AM
abrowaqas

3 
779 
I'm trying to tackle the workenergy theorum.
It has occured to me that the distance in work: Force x distance
...

Oct204 06:43 PM
Pyrrhus

3 
4,719 
Hi,
So v=ω*r
Where v = velocity in m/s
ω = angular velocity in rad/s
r = radius in m
But I am...

Sep2113 10:02 AM
Coop

3 
632 
Hello,
I'm sorry if this question seems a bit ignorant, but I don't yet have an extensive knowledge of physics. My...

Oct2910 03:21 AM
Brin

4 
944 
hi!...
Does anyone know the relationship (i mean formulas) relating to the incoming air velocity to the rpm of a wind...

Jan3011 07:30 PM
dioross

3 
1,028 
Hey Guys,
I was wondering which types of waves travel faster in optically dense materials and which waves travel...

Dec1710 03:34 AM
srikanthdeenu

2 
5,733 
How we can face the speed of the molecules on the gas kinetics theory and the speed barrier of light ?
because ...

Jan2506 12:17 AM
mma

1 
2,968 
This may be fairly straightforward but it is a concept that I am really having problems understanding. A sound wave...

Dec2213 01:13 PM
darondny

26 
1,486 
I've preformed an experiment about the speed of sound waves in water and I found that sound travelled faster in hot...

Apr1412 04:14 AM
Bobbywhy

1 
5,229 
The question in the title. Speed of sound in a medium obviously must be less than the speed of light. Speed of sound...

May1311 08:49 AM
pyrotix

2 
1,587 
When an object is thrown out from the front of a vehicle, its initial velocity relative to the ground is the velocity...

Jul1512 02:50 PM
Darwin123

7 
1,543 
Speed of sound at a specific temperature is independent of Pressure as Pressure varies directly with density.
So...

Jun2812 04:27 PM
Philip Wood

8 
5,106 
If I have a glass of water and tap it with a spoon there will be a sound. If I change the speed of sounf by adding...

Apr205 05:14 AM
strid

9 
1,711 
how does the speed of sound vary with temperature in an ideal gas? how do we derive this relation?

Sep1405 09:29 AM
benitta

4 
1,015 
I was just doing a thought experiment..
So when you are sitting in a car that is moving, your speed relative to...

Nov1612 12:30 AM
Simon Bridge

2 
740 
If a person has reached terminal velocity (say 50m/s), and he opens his parachute, and I want to find his speed 2...

Mar1911 10:35 AM
chengbin

0 
1,001 
My friend and I wondered this in junior high school: since a record (as in the kind played on a record player) or an...

Sep208 07:01 AM
cabraham

13 
7,113 