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

Apr2211 05:26 AM
ZapperZ

1 
47,674 
I want to ask why a rod's rotational inertia with rotational axis at its end is not
1/2 mR2 but 1/3 mR2?

Apr1012 01:42 AM
K^2

4 
933 
it was pointed out to me that a venturi won't function if the pressure differential before and after the venturi is...

Apr1012 01:26 AM
K^2

1 
730 
I recently read that the earth's axial tilt fluctuates between 22 degrees and 24 degrees. Can someone explain what...

Apr912 11:47 PM
McLaren Rulez

5 
1,623 
I'm reading Thermal Physics by Kettle and I feel I'm having trouble really grasping what entropy is. From my lower...

Apr912 11:34 PM
Rap

1 
1,185 
Let's consider a system of three boxes stacked vertically, resting on the ground. There is friction acting between...

Apr912 10:36 PM
Acala

6 
1,106 
Question about analytical mechanics.
Suppose we have a system with N degrees of freedom, and hence N generalized...

Apr912 09:36 PM
Hassan2

17 
1,956 
I was studying RC circuits recently and I'm interested in this:...

Apr912 09:07 PM
titaniumpen

0 
1,079 
What pressure does diesel fuel become explosive at?

Apr912 08:27 PM
pezzer30

0 
570 
so i have been studying chaotic system in class, and i just want to know if we change the initial conditions of a...

Apr912 06:30 PM
Filip Larsen

3 
931 
My question is at the bottom of this post
PREAMBLE:
If a dipole is turned by an angle θ (in a uniform electric...

Apr912 04:30 PM
Jonnie79

1 
1,019 
I have just returned from a holiday in turkey, and the resort we stayed at had a water slide that ran into the pool....

Apr912 02:39 PM
willem2

19 
10,729 
I'm hoping someone can help me. I have only a rudimentary knowledge of physics, but have strong scientific instincts,...

Apr912 08:51 AM
AlephZero

9 
1,255 
Hello, I was just thinking about an inductor and how inductors store energy in a magnetic field around them. I then...

Apr912 06:29 AM
mfb

5 
1,243 
If
Work= \intFdx
and
Potential Energy, U= \intFdx
What is Work in terms of potential (and potential and...

Apr912 03:59 AM
henpen

0 
1,193 
Does a magnetic flux tube always have a current flowing in it?
Where is the current? Electrons on the surface and...

Apr912 03:58 AM
ImaLooser

2 
967 
Hey,
I needed a clarification regarding this.
Are photovoltaic cells ohmic devices? Or if I consider an entire PV...

Apr812 11:59 PM
sj21

5 
1,337 
Hello, I'm pretty horrible at thermodynamics (one of my weak subjects I'll admit) so sorry if my questions are real...

Apr812 09:29 PM
Matterwave

19 
2,245 
Could you make a fluorescent lamp with krypton instead of neon or mercury? The wavelength doesnt really matter its...

Apr812 07:15 PM
Andy Resnick

6 
976 
Is it true that by finding exact resonant frequency we could ionize
matter or split molecules?
What is frequency to...

Apr812 07:03 PM
Lewsiffer

5 
3,976 
Consider a wire of length l. At time t=0, one end of the wire is at temperature T_0, while the rest of the wire is at...

Apr812 06:31 PM
haruspex

7 
2,049 
The SturmLiouville Equation describes normalmode solutions to the general string equation:
...

Apr812 01:28 PM
Jolb

0 
596 
Hi,
I just want to make sure my intuition is correct for why capacitors add normally when placed in parrallel and...

Apr812 01:05 PM
Genericcoder

2 
1,029 
http://www.komal.hu/kep/abra/03/55/f7/9a715fb33559555ca03369cc9.gif
I have to calculate the small oscillations around...

Apr812 01:00 PM
OldEngr63

1 
692 
For an object sliding on a horizontal surface, there is a dive effect caused by friction. This means that the front...

Apr812 09:29 AM
mfb

4 
855 
I'm a little bit confused about this...i know that when a currentcarrying conductor is placed in a magnetic field, it...

Apr812 07:49 AM
tinytim

1 
2,234 
Hi there,
Is there someone who would know how to solve the following potential flow theory problem:
How to find...

Apr812 05:54 AM
Armin1986

0 
826 
Also, what are some good resources for learning ABOUT physics?

Apr812 03:33 AM
Physgeek123

4 
681 
Hey Guys! I need help with interpreting something regarding simple barometers. I believe I understand what is going on...

Apr812 02:13 AM
nicu

1 
1,167 
Hi, I learnt the basics about tensional force and I have some queries about it. I'm hoping you guys are able to clear...

Apr712 11:41 PM
Hassan2

4 
819 
Here is the run down first, I'm trying to find a min mass flow rate for my project which needs to be 1 GPM, and max 4...

Apr712 08:49 PM
bhaarat316

2 
1,013 
Hi,
So if I start with the boundary conditions
U(0,t) = T1 and U(L,t) = T2
and T1 does not equal T2, it...

Apr712 08:05 PM
wumple

0 
656 
Well, I'm not a physician so, maybe my doubt is a little fool. Well, I'm mapping the light emitted by some lamps in...

Apr712 05:41 PM
Fpmagnani

0 
1,095 
Hi guys,
Their is something I don't completely understand regards to parrallel/series circuits.
We know that the...

Apr712 02:57 PM
Genericcoder

4 
941 
In the proof that I have studied, there is a Isothermal cavity that behaves as a black body. there is another small...

Apr712 01:57 PM
mfb

3 
1,191 
See attachment for my text's explanation's on the permittivity and permeability of free space, if you want but it's...

Apr712 01:02 PM
Bob S

2 
2,302 
Hi, I was hoping someone would be able to help me with a microscopy problem that has been puzzling me for a while.
...

Apr712 09:32 AM
stephenx_86

3 
3,264 
Hi all,
I have a conceptual question about the net force of a rotating or spinning ball attached to a string. If we...

Apr712 09:26 AM
rcgldr

3 
2,325 
I need a good book, or in other words a book and it's solution manual if available on line  in classical physics....

Apr712 07:16 AM
M. next

2 
1,439 
hello. i recently came across this question in which a satellite is put into orbit at a point around a planet with...

Apr712 06:20 AM
D H

9 
1,652 
Does the amplitude of a wave changes when the source is moving? I am mainly interested in waves in a medium (e.g....

Apr712 05:17 AM
sk9

8 
4,957 