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

Apr2211 05:26 AM
ZapperZ

1 
47,660 
Suppose you have a ring of charge and they cant move around. and you spin it, of course, we will have current. What...

Oct1209 12:25 AM
dragonlorder

2 
692 
Hi all,
I am taking undergrad classical mechanics this semester and we are using Thorton and Marrions Classical...

Oct1109 12:17 PM
Monocles

4 
995 
Is there a way to monitor and block intrusive radio waves?

Oct1109 09:53 AM
Naty1

1 
805 
Hi there,
first of all:
This is not a homework task or something like that. It is just one of my interests and I...

Oct1109 08:00 AM
al3ko

2 
1,105 
A point charge moving at constant velocity causes unconstant changes in the electric field. Won't that generate an...

Oct1109 05:23 AM
Bob_for_short

7 
1,505 
I was trying this mental exercise and I need help and confirmations.... so please launch your comments
Imagine (as...

Oct1109 04:19 AM
sophiecentaur

51 
4,873 
for example, isn't the derivative of the first derivative squared:
d/dt (y')^2 = 2y'y''? why does susskind claim...

Oct1109 12:41 AM
Hepth

1 
995 
The whole idea of an electric field induced due to a changing magnetic flux seems to run wildly counterintuitive to...

Oct1009 08:00 AM
DrZoidberg

4 
1,162 
What is meant by total negative energy associated with bound bodies like planets. and also total energy of the...

Oct909 07:19 PM
granpa

3 
1,017 
I've always thought that the work done by a force is the scalar product of the force vector and the potential...

Oct909 06:15 PM
Vykan12

3 
539 
Here is how my book goes about defining the moment of inertia.
Now here's how my book goes about deriving an...

Oct909 05:43 PM
Vykan12

1 
607 
I'm having trouble figuring this one out. Hope someone can help
A ball dropped from rest accelerates at a rate of...

Oct909 04:27 PM
Franco_v

3 
1,073 
Hi guys. My question is related to proving Gauss's law by using Columb's law. Let start with a charge density...

Oct909 02:20 PM
sadraj

2 
1,742 
Hey there, I recently solved for the resonant modes in a 3d metal box.
Thats nice, but I was wondering about how to...

Oct909 02:15 PM
f95toli

1 
1,039 
My textbook claims that we can describe the kinetic energy of a rigid body as follows:
K = 1/2 Mv^{2}_{cm} + 1/2...

Oct909 11:36 AM
Vykan12

13 
1,441 
This was on my exam today and I'm not sure if I was doing it right:
At what angle must a projectile be launched at...

Oct909 08:32 AM
Andy Resnick

1 
613 
hello,
consider a man falling from a roof with a heavy box in his hands. what should he do with the box?

Oct909 07:41 AM
A.T.

14 
1,366 
What is the electric field outside a steady state current loop?
Why is this not discussed in textbooks?

Oct909 03:32 AM
mathperson

27 
4,293 
Given a solenoid we can find the field inside and at the ends by B=urNI.
Now, what is the field strength at some x...

Oct909 01:41 AM
I_am_learning

4 
848 
Seeing as there is no net force on a magnetic dipole placed in a magnetic field ( only torque ) , and that magnetism...

Oct809 09:24 PM
SANGHERA.JAS

4 
968 
I wonder how does Lloyd's mirror works, how does it produce the interference pattern? I look for many text book, but...

Oct809 04:41 PM
Dadface

4 
7,417 
A centrifuge have the speed of 1600rpm. It takes 10 seconds for the centrifuge to reach maximim speed. How many turns...

Oct809 04:21 PM
tinytim

1 
746 
Hello Forum,
Using a fixed, Cartesian reference frame (i.e., we, observers, are stationary and located at the...

Oct809 02:55 PM
fisico30

2 
1,904 
I have a question on setting up a problem to find the reactions and forces in members of trusses.
So initially I...

Oct809 02:51 PM
tinytim

1 
645 
de broglie wavelenth of a perticle approaches zero faster than 1/v as its speed approaches the speed of light..how can...

Oct809 02:02 PM
hasanhabibul

0 
594 
1) g is not a function of height...or till what hight above the earth's surface can it be considered as...roughly...

Oct809 09:29 AM
dE_logics

6 
1,564 
Ok.. first of all excuse my English (not my native).
I had a conversation with a friend and we were thinking.. We...

Oct809 05:52 AM
mpekatsoula

2 
1,041 
Hi,
Apologies if I've misinterpreted / misread something here (not a physics student  just a general interest)....

Oct809 02:58 AM
Simon76

4 
1,512 
This is doing my nut in. I'm looking at causes of errors in a rotating gradiometer. It uses a loop of superconductor...

Oct709 11:10 PM
Pogo

1 
749 
According to source i read, in classical theory it its believed that charged particles radiate when the accelarate ...

Oct709 09:27 PM
jason12345

38 
7,338 
It is not a home work.
Let us suppose that at t=0 a particle is at rest. At t=0 we switch on a periodic force F(t)...

Oct709 02:41 PM
Bob_for_short

6 
935 
hi,
suppose a man is swimming in a pool. as the potential of solvent(water) is greater in the pool than in the cells,...

Oct709 01:25 PM
AGADOTTI

4 
1,057 
Hi,
I've an experiment in which I've some magnetic material place into a coil that's used as sensor. Say it's a...

Oct709 12:25 PM
flying_fred

1 
1,597 
why energy corresponding to the most probable speed is not equal to the most probable energy i.e. Ep=1/2*k*T and it...

Oct709 11:51 AM
hasanhabibul

0 
530 
I was taught in my Eletricmagnetics Lessons that the density of electric charge is higher near the surface with big...

Oct709 11:41 AM
jambaugh

3 
1,239 
When a forced oscillation is damped, it is true that the frequency at which resonance occurs decreases right? so does...

Oct709 08:04 AM
FredGarvin

6 
25,274 
Hello, I'm have just started on this subject, and I am confused with the following equation:
since E(t) = kq(t)
...

Oct709 01:36 AM
nnnm4

2 
635 
In fundamental optics, we know that "There is no phase change when the wave is reflected from a boundary leading to a...

Oct609 11:39 PM
KFC

0 
973 
Is this correct?
What I mean to say here is that suppose a force (x) applies through a mechanism and all the force...

Oct609 10:43 PM
dE_logics

19 
2,064 
wrong form sorry.

Oct609 09:14 PM
ph351

0 
749 