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Quality answers to common physics questions
Jul24-14 11:39 AM Greg Bernhardt 
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Jan16-12 Greg Bernhardt
Before posting anything, please review the Physics Forums Global Guidelines. If you are seeking help with a...
Apr22-11 05:27 AM
ZapperZ
2 69,467
The aim of this thread is to highlight recent (as in within the past 3 months) noteworthy physics papers that have...
May6-14 04:32 AM
Cthugha
168 186,505
How to prove that energy travels at group velocity and not phase velocity?
Jun17-14 07:15 PM
UltrafastPED
1 239
Hi, I was thinking of something: How are one supposed to calculate the moment needed for a scoop to scoop up a...
Mar3-14 11:51 AM
sophiecentaur
1 240
This is about wave reflection and transmission. For an infinite string with a density change at x=0, consider an...
Apr22-14 10:06 AM
UltrafastPED
1 240
So I can't find this anywhere, but I would really like an answer as it's driving me up a wall; Are the amplitudes of...
Jun16-14 12:34 AM
Drakkith
6 240
How many reflections will be made by a light entering a 2m long optical fibre cable. If the angle of incidence with...
May6-14 04:40 AM
Rahulr2k
2 241
We are constructing a dip coater in our laboratory. But because of the disparity between the lowest and highest speed...
Jan24-14 06:28 AM
Drakkith
1 241
Hi. I am trying to understand the multiplicity function Ω!/L!(Ω-L)! where Ω= number of boxes and L= number of...
Apr8-14 03:54 PM
leeone
2 241
Say for example you have take a sample of 500ml from a bulk saline solution (NaCl and H20). If you know that for every...
May30-14 09:42 PM
Nathanael
1 242
So I play the guitar, and I cannot use the same amp I use to gig with, because in my home basement, it's too sharp and...
Y 03:24 PM
enorbet
10 242
An environmentalist friend of mine wants to cool a building on his property (something like a shed or workshop) not...
Jul30-12 12:19 PM
Sultan of Hel
0 243
Hi, all there is question with its solution in the picture which I understand but wanted to approach in a different...
May19-14 04:49 AM
mech-eng
0 243
This may be intuitively obvious to you and I'm just missing it. Say you had 3 balls each with a mass of 1g. Each...
May10-14 06:54 AM
UltrafastPED
3 244
What's the difference between electric and magnetic fields, specifically I someone was to send a charged particle into...
Jun9-14 12:45 AM
Simon Bridge
2 244
It is given that: 1 kg of 0 degree celsius ice is put into a cup of 0 degree celsius cold water. is the...
Jun16-14 07:14 AM
DrClaude
8 245
I don't know how to integrate the Maxwell-Boltzmann distribution without approximation or help from Maple. Given...
Jun10-14 07:05 AM
TeslaPow
2 246
Hi Everyone, I am currently researching some corrosion pits that are growing in a spiral fashion. Can anyone...
Apr9-14 05:27 AM
streeters
0 247
Hello everyone, I'm studying the large plastic deformation theory based on the multiplicative decomposition of the...
Jun17-14 03:17 AM
trabo
0 247
Hello everyone I am reading a lot about Stimulated Brillouin and Raman scattering I read the following difference...
Jan23-14 07:50 AM
eahaidar
0 248
Hello, Wikipedia states: Phase changes, such as melting or evaporation, are also isothermal processes. I am...
Jun1-14 03:29 PM
Chestermiller
2 248
Hello , I have a rather odd question. I am trying to find a phenomenon that occurs in nozzles but am quite unable...
Feb19-14 03:38 PM
ajd12
0 249
Hi everyone, I'm new to transistors analyzing, and I need a way to correctly identify the voltages. Let's take...
Jun18-14 07:04 AM
phyzguy
8 249
do negative charges in electric fields of positive charges have negative electrostatic potential energy? am I write in...
Mar1-14 05:48 PM
dauto
1 250
Why is the focal point to the left of a concave lens called the second focal point? Isn't it just a matter of the...
Jun12-14 06:27 AM
jtbell
2 250
So if an EM waves travels from one medium to the other, it refracts depending on Snell's law. But what happens when...
Apr3-14 12:24 AM
UltrafastPED
1 251
As we know there is no charge inside the conductor.(Consider the solid conductor......) All the charge will...
Jun3-14 03:39 PM
nasu
1 252
Graduated College over thirty years ago. In physics, I recall a a question where one is required to weigh an object...
May15-14 08:58 AM
NascentOxygen
1 252
Hi, I was wondering if there was an equation for the flow rate through a straight vertical or angled capillary...
Jun4-14 11:33 AM
Andy Resnick
2 252
I've got a few things I want to make sure I have right about refrigerators. When the fridge operates, it removes heat...
Jun23-14 10:55 PM
NascentOxygen
1 252
Say we have two separated observers which have a velocity relative to each other and are both looking at a system. By...
May16-14 08:03 PM
mfb
1 253
Can someone maybe explain me(or has a good link to a page where this is explained) why scattering in perpendicular...
May20-14 10:09 AM
jennyjones
0 253
Hi all, I am trying to understand about collision frequency that happened in ionosphere layer. In D region, below...
Jan29-14 01:33 AM
s_hy
0 254
https://www.youtube.com/watch?v=f8S0PeOvHAA I have a number of questions about the above video: What are they...
Jun15-14 10:25 PM
Simon Bridge
1 254
What is the highest efficient solar cells out there? I heard there was one that is 80% efficient. And there is a clear...
May12-14 11:41 PM
Bobbywhy
1 255
Can anyone speak on the spectrum of sunlight reaching the upper atmosphere and the surface ? Specifically I interested...
Jun2-14 02:42 PM
UltrafastPED
4 255
Question : The top of the atmosphere is at about 400 kV with respect to the surface of the Earth, corresponding to...
Jul27-14 06:23 AM
NascentOxygen
1 255
Hi Is the drag coefficient for a particular object the same in different mediums? Say we have Cd = 1 in air for one...
Jan22-14 10:58 AM
cjl
3 256
Can someone please explain what the parallel axis theorem is?
May30-14 06:33 PM
sophiecentaur
2 257
Angular momentum L is defined by summation of mrxv about a certain point. For a rigid body that rotate about an axis...
Jun15-14 09:30 AM
mattt
4 257
An electromagnet pulls a ferromagnet from a distance(r), now there is a change in flux. The total magnetic field in...
Feb24-14 12:39 AM
Dash-IQ
0 258
While using the potentiometer to measure the emf of an unknown battery the slider is adjusted so that the reading in...
Apr8-14 02:38 AM
Bobbywhy
1 258

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