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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
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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
168 190,905
This is quoted from "The Elegant Universe" "the velovity of light is a kind of cosmic speed limit, a speed that...
Oct21-12 06:39 AM
harrylin
17 2,389
If we have a box with mass m placed on a horizontal tabletop. Then we push the box a distance of d. THe coefficient...
Oct21-12 04:35 PM
daivinhtran
7 1,388
i no that the frequency range limits are determined by the cochlea where the low frequency sounds are localized on one...
Oct21-12 05:21 PM
sophiecentaur
2 1,606
OK i am doing a plan design lab about magnetics so the aim is to investigate how to force between two mangnetics...
Oct21-12 08:21 PM
physicskid12
2 533
A man of mass mm = 95 kg decides to paint his house. To do this, he builds a platform using a uniform beam with a mass...
Oct21-12 10:19 PM
haruspex
2 1,821
I was reading a book, 'Introducing Quantum Theory' by J.P.McEvoy, and I find it difficult to understand in details of...
Oct21-12 11:03 PM
SMarioKingdom
2 671
Why doesen't hand swaying produce sound and why does my slight scratching my skin produce an audible sound?
Oct22-12 03:05 AM
and7barton
2 535
In our lab we are to measure speed of light by making a light signal travel through optical fiber. At one end there...
Oct22-12 03:28 AM
sophiecentaur
8 1,311
Hi All! I'm Armenia,learning in the faculty of Physics in our State University. Recently while one of lectures we...
Oct22-12 09:20 AM
Naty1
19 2,697
Greetings! I'm working on a project that Requires a roughly equal number of up and down spin electrons to be injected...
Oct22-12 09:30 AM
mfb
7 1,173
I need some help understanding how much information I can pull out of this data. I have a sample made up of two...
Oct22-12 09:45 AM
mfb
1 638
First of all, I'm 13 so I might not comprehend the complex vocabulary or symbols others might use. Second, I just...
Oct22-12 09:51 AM
mfb
3 1,230
I am trying to solve a question which gives me the volume of a mixture and its specific gravity and the percentage of...
Oct22-12 11:45 AM
HallsofIvy
2 2,267
This is a paradox that has been bothering me since I was taking algebra in high school. Let's say that I want to...
Oct22-12 11:47 AM
HallsofIvy
13 1,683
I have an equation for a non-relativistic particle, in relation to quantisation of a particle in a box, which states:...
Oct22-12 03:54 PM
Mark M
1 851
Let's say an object is held at rest by a force opposite of gravity for a given amount of time. Since it takes energy...
Oct22-12 04:01 PM
Drakkith
43 5,063
Doesn't Felix have an advantage when breaking the sound barrier since the air in which he is moving is less dense,...
Oct22-12 04:06 PM
cjl
6 1,072
Hi all, Question about compressing a gas. When you compress a gas it heats up. Does the compression supply a...
Oct22-12 05:04 PM
Khashishi
3 833
So I know the law of energy conservation applies when dealing with electric force, but I don't quite understand what...
Oct22-12 05:35 PM
JustinRyan
12 973
So, the question I ask is simple : " Is a screen necessary to view a real image?" For example, when I view my image...
Oct22-12 05:49 PM
sophiecentaur
8 1,919
hi i have come across a post regarding ignition spark in cars with waste spark management. and my question is... that...
Oct22-12 07:13 PM
davenn
18 1,407
Other than nearby light pollution. Or is that the only reason?
Oct22-12 07:24 PM
davenn
10 1,496
Hey all, I was wondering if someone could explain the difference between isothermal and adiabatic processes. I know...
Oct22-12 08:37 PM
Thundagere
2 890
"Force acting at an angle doesn't exert pressure on a surface". Is this statement correct or wrong?
Oct22-12 09:07 PM
JustinRyan
12 1,277
can anyone tell me the weight of earth?
Oct22-12 09:44 PM
Khashishi
10 811
Hi everyone, First off I do realise that I can't directly convert force to velocity. My scenario is that I have...
Oct22-12 10:27 PM
Chestermiller
14 1,608
What happens to range if the initial height is doubled. Say if something is shot at 2 ft and then its shot at 4 ft...
Oct23-12 12:07 AM
haruspex
4 855
hello! I come across various "energies", like free Gibbs energy, enthalpy, entropy, etc (okay, to be precise,...
Oct23-12 02:34 PM
Khashishi
5 919
I am abilogist who recently have to describe medical imaging....In this while explaining Bremsstahlung radiation, I am...
Oct23-12 02:37 PM
Khashishi
4 768
Looking at the free body diagram of a fixed pulley with a rope going over the top half, the diagram would show tension...
Oct23-12 03:03 PM
sophiecentaur
5 1,628
Do cloud chambers have any practical use in daily life? I mean, nowadays you can pretty much go and buy a Geiger...
Oct23-12 07:33 PM
Thundagere
4 560
To calculate the exact fall time of a mass, constant g is often used for a short distance traveled as for example in...
Oct23-12 08:05 PM
TurtleMeister
8 1,535
I'm sorry to be annoying on this forum, I am new to the physics world! I am an undergrad taking physics I but am also...
Oct23-12 10:41 PM
lunaskye0
4 1,200
I'm not sure where to put this thread, so I just placed it in here. One thing I know is that a newton is the net...
Oct24-12 12:51 AM
dannielwang
9 1,586
I can't represent me mentally what is an electromagnetic wave. I know that a mechanical wave is the propagation of...
Oct24-12 04:29 AM
sophiecentaur
26 2,405
If the temperature is kept constant,what happens to internal energy if the pressure is increased in piston?
Oct24-12 05:32 AM
Smileyxx
9 1,185
Hi a simple question that struck my mind.Let's imagine a ferrite magnet from a old loudspeaker now let's put that...
Oct24-12 06:49 AM
AJ Bentley
7 623
I need a simple method to measure eddy currents in a pipe. Thanks.
Oct24-12 09:17 AM
AJ Bentley
1 471
Hello, i was wondering if someone can help me out. I finished law of momentum, and learned that for the conservation...
Oct24-12 09:38 AM
jtbell
4 820
Hi, In a power transmission cable, the power, P=24W, Voltage=12V, the resistance of the cable, R=4 ohm. What is...
Oct24-12 09:58 AM
CWatters
7 1,362

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