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Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
47,884 
How does circular motion in a cone without gravity work?
If I have an object and I let it circle through the inside...

Apr2912 09:29 AM
Cleonis

2 
1,409 
I do not know the exact electrochemical reactions which make a battery work, but I understand that the essential...

Apr2912 08:30 AM
phinds

16 
3,286 
I've read that permittivity is resistance offered to flow of field lines,But vacuum does not have anything in it to...

Apr2912 08:27 AM
PhilDSP

22 
3,215 
Ok , so I was wondering if you could legally build a cyclotron accelerator , I am fourteen years old , so if there...

Apr2912 06:53 AM
Vanadium 50

6 
1,104 
I would like to know if pressure is different in water due to the difference of gravity (like 1/d²) ? If yes, why a...

Apr2912 06:32 AM
Gh778

16 
1,329 
Hallo everyone.
I had a equation about energy in a form of "rotational kinetic energy".
Imagine this situation...

Apr2912 06:27 AM
jartsa

15 
1,528 
right now, I'm following the MIT thermodynamics video lecture.
I've gone thru
dU = dw + dq
(d for "is path...

Apr2912 03:52 AM
mSSM

1 
4,150 
So given any vector field V(x, y, z) in three dimensional space, is it possible to create an electric field that is...

Apr2912 03:05 AM
vanhees71

1 
822 
By definition
total energy of a system= (internal energy U) + K.E + P.E
and
mechanical energy of a system= (flow...

Apr2912 01:14 AM
Ritz_physics

0 
512 
Hi, I'm looking for the derivation of (BH)max of a permanent magnet,
(BH)max= {Uo*(Ms)^2} /4 Uo =...

Apr2912 12:37 AM
physlover1015

0 
1,120 
Hi,
I'm having trouble understanding what the relation is between the impulse of a force during a collision and the...

Apr2912 12:31 AM
Froskoy

3 
1,344 
I was curious about this subject after it came up on my last physics test. However my teacher never covered this...

Apr2812 10:52 PM
ozone

4 
2,008 
A question about Thermodynamics, if someone would help with that...
I understand a steam engine that follows the...

Apr2812 09:33 PM
watermotorman

5 
1,505 
Hey all,
I'm just working through the london theory of superconductors. I've dervied the london penetration depth,...

Apr2812 01:31 PM
Bob S

1 
863 
Hello,
I'm a high school senior and I'm trying to find an equation to calculate the force in the x direction...

Apr2812 12:11 PM
no clue stu

0 
1,218 
there was this question that i saw in a book and it also had an answer .
(this is not a homework question)
The...

Apr2812 09:54 AM
mfb

1 
885 
I have seen solutions of many problems in which an object going in straight line has angular momentum, especially...

Apr2812 07:54 AM
sweet springs

2 
3,012 
As we know a circle view at an angle appears as an ellipse ,
as you see in the picture, the center of the camera aim...

Apr2812 01:11 AM
OFF_Smog

2 
804 
IF F=MGcos θ AND THE ANGLE BETWEEN F AND D IS θ
THEN WILL THE WORK BE MGcos2θ?

Apr2712 07:54 PM
K^2

3 
700 
There is a spherical lead ball with a spherical cavity. It is heated. The size of the cavity increases. Why does it do...

Apr2712 06:25 PM
Drakkith

10 
1,809 
Hi,
I have a question about lightning return strokes. It makes sense when I think about the return stroke on its own...

Apr2712 03:15 PM
Bobbywhy

5 
1,409 
Hi there.
I was just wondering how does a force actually casue motion of body .. and what are the factors that...

Apr2712 12:23 PM
A Dhingra

12 
2,234 
I am unsure about the virtual displacement and work definition even after looking through the definition and seeming...

Apr2712 11:54 AM
Hassan2

4 
1,196 
Mythbusters did a test to see if a water heater would shoot through the roof of a two story building (home). They...

Apr2712 09:15 AM
K^2

4 
1,108 
I'm quite curious as to whether there is an equation (whether it be in scalar, vector, or tensor form) that defines...

Apr2712 09:09 AM
Ali, Ahmed

3 
1,308 
When i apply torque on a body, it will rotate around whcih axis? I guess its the axis along centre of mass but i don't...

Apr2712 08:43 AM
mfb

3 
965 
So, I have been thinking about this idea for a long time. I have heard that if you travel behind a semitruck, then...

Apr2712 08:22 AM
Lsos

2 
583 
Hi physicsforums mates,
I came across an interesting application question online on optimal mass / velocity.
The...

Apr2712 05:49 AM
haruspex

9 
2,427 
Hi guys, I came across a pretty weird question regarding electricity in a parallel circuit. There are two branches of...

Apr2712 03:35 AM
sgstudent

11 
1,237 
Hi
There is lots of text, but it is actually just a presentation of facts and thoughts to explain where I am in all...

Apr2712 12:46 AM
Drakkith

1 
839 
I have a question about calculating induced surface charge:
Consider a system composed of an infinite grounded...

Apr2612 10:25 PM
haruspex

19 
4,941 
Hi everyone,
I've been reading about electricity lately and I've run into a question that has been bugging me for a...

Apr2612 08:18 PM
rcgldr

4 
3,913 
Hallo everyone!
I'd like more about the energy in the magnetic fields of a magnet is there major amounts of energy?...

Apr2612 04:57 PM
mfb

2 
908 
"Setting Your Thermostat for Maximum Energy Savings" by Jeffrey Orloff claims that during warm months, setting an air...

Apr2612 03:20 PM
QuantumPion

13 
3,695 
Can anyone tell me the value of cyclotron frequency with full mathematical proof and explanation?

Apr2612 01:49 PM
Bob S

2 
631 
For a wave travelling from a medium with refractive index n1 to n2 with n2 > n1, the amplitude reflection coefficient...

Apr2612 12:00 PM
Born2bwire

1 
2,738 
In Feynman lectures vol 2, chap 28, it is given that for an electron at rest, the net self force exerted on itself is...

Apr2612 08:49 AM
Dickfore

13 
1,678 
There are (at least) two issues regarding the presence of ferromagnetic materials around an MRI scanner (of strength...

Apr2612 07:54 AM
dhigger

0 
818 
I am doing a presentation on energy as part of a class project.As part of the presentation I would like to physically...

Apr2612 05:50 AM
Philip Wood

3 
911 
Hi,
In class we were discussing the effects of a two bar magnets being dropped through a copper tube at around the...

Apr2612 03:43 AM
Xiao10

2 
1,301 