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Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
46,878 
hello, I'm new here =D
dunno if this is the right section to ask this
I'm really confused about power voltage and...

Aug308 12:24 PM
russ_watters

4 
13,437 
Hello all,
Just wondering if someone can give me a brief explanation of Wood's anomaly with regards to optics.
...

Mar2211 07:16 PM
astrosona

2 
13,430 
Hi..
I have a question about AC magnetic field, wondering if you can help me understand this.
For a DC solenoid...

Jun1109 12:00 PM
Bob S

11 
13,424 
Our physics teacher gave us a formula to calculate intensity, she didn't really specify what intensity, it should be...

May3012 08:53 PM
nasu

1 
13,401 
is an emf produced by a changing magnetic field or by a moving magnetic field?

Nov2008 01:23 AM
Robin07

31 
13,391 
I am trying to find out how fast a vertical cylindrical water column heats due to the ambient temperature. I already...

Jun710 07:48 AM
Rimidalv

6 
13,385 
I tried posting a similar question before, however, I've found the 1 reply is actually wrong. Hopefully with better...

Jan2408 08:16 AM
Andy Resnick

2 
13,383 
I was told by my teacher that the definition for distance is just "the amount of ground covered", and that...

Feb1509 11:33 AM
KellyOsbourne

4 
13,370 
when inertia can act as athe mass ,force and generate momentu, the why another word called mass moment of inertia. how...

Jul3108 04:04 PM
PatPwnt

11 
13,327 
I'm studying for the Physics GRE and going over my thermo notes.
Ok, so for enthalpy change
(delta)H = (delta) U...

Oct1409 08:21 AM
Mapes

5 
13,305 
Since running a current through a wire will increase the temperature of the wire, is there an equation for calculating...

Dec2309 12:34 PM
Jake110

14 
13,287 
Hi,
I've always tken for granted that KE=(mv^2)/2, but never seen the derivation! I think it probably comes from U=...

Feb1806 06:29 AM
Doc Al

1 
13,274 
Is the parallel axis theorem always valid for inertia tensors? We have only seen examples with flat (2d) objects and...

Dec108 08:19 PM
adriank

6 
13,262 
As far as I know, you can't prove laws, but anyway...
We got to do an experiment at school. A weight is suspended...

Jan1612 05:29 AM
harrylin

35 
13,217 
Hello!
First post here :) Hope this isn't too simple for this forum...if so, by all means give me a pointer...
...

Oct410 01:42 PM
Zeppos10

26 
13,207 
Why is it that the equation for work done to stretch a spring is
W = 1/2k(x22x12)
while the work done by a...

Sep2009 08:26 PM
woodie37

11 
13,178 
They say that vector laplacian is defined as the following:
\nabla^2 \vec{A} = \nabla(\nabla\cdot\vec{A}) ...

Dec208 03:54 PM
bcorso1

12 
13,176 
Hey Guys,
I know that this has been posted before, but mine is slightly different.
Our instructor only provides:...

Dec1907 08:16 PM
pervect

6 
13,169 
When a voltmeter measures the AC voltage in a circuit, does it measures the rootmeansquare value of the voltage? Is...

Oct1407 03:34 PM
mourici

14 
13,137 
I've got an investigation in which iam investigating the factors affecting the perioad of a BIfilar pendulum. So has...

May605 12:57 AM
Graham

12 
13,136 
Hi everyone,
I am no expert in any means, so if what I am asking is silly, just tell me.
This is an example. ...

Dec1912 11:57 PM
Chestermiller

16 
13,078 
Hi,
1) Can anyone explain to me from a conceptual standpoint, why increased current leads to an increased voltage...

Sep910 07:49 AM
ZapperZ

23 
13,043 
I jump off a high bench (5ft high) to the ground. What is the gforce of the impact and how do you calculate it. It...

Apr1209 03:58 PM
joec_49

7 
13,020 
The air temperature at an altitude of 10,000 meters is a chilling
35º C. Cabin temperatures in airplanes flying at...

Feb2204 05:22 PM
russ_watters

5 
13,003 
Conservation of linear momentum is consequence of which one of Newton's three laws?

Feb2309 11:10 PM
vjraghavan

9 
12,997 
I know the basic answer, that the movement of air sets things vibrating which makes noise, but I don't know the...

Apr2706 03:34 PM
miket

3 
12,973 
hey guys just a quick question
Does anyone know the u value of jusy normal glass?
Ive looked everywhere and ive got...

May909 08:30 AM
russ_watters

3 
12,906 
Does the metal pole of most umbrellas increase significantly the risk of the bearer being struck by lightning? In...

Oct2810 01:51 PM
Bob S

9 
12,896 
So what is it?
This is not a homework question. But I anticipate a good discussion.

Jan2304 05:50 PM
ketch

23 
12,876 
I've been having problems trying to come up with an answer for this seemingly simple question. I would think that...

Apr2205 02:32 AM
adiputra

11 
12,865 
hey guys, i've been experimenting with a pendulum and while doing the error discussion for my experiments i got stuck...

Apr2809 08:46 PM
Volcano

8 
12,860 
Hi, question here.
Newton's second law is so intuitively obvious to anyone not even hearing or reading his law in...

Sep2513 11:56 AM
Andrew Mason

74 
12,853 
I was tutoring a student in an optics lesson the other day. We discussed the foundational concept, that light travels...

May2713 12:46 AM
Rajashik

41 
12,836 
There is no net gravity in a hollow sphere. You can get this result using calculus but that's not really...

Oct109 01:30 PM
stone1

29 
12,817 
I have been doing mechanics in college and in the present chapter,two of the concepts that I found rather confusing...

Mar2511 02:51 PM
tinytim

18 
12,811 
Why is the triple point of water .01C while the freezing point 0C? It seems contradictory.

Oct2407 12:26 AM
animalcroc

7 
12,796 
What is the difference between "uniform plane waves" and "planes waves." Are these terms used interchangeably?
What...

May107 08:21 PM
Claude Bile

16 
12,759 
Can someone give me the equation to calculate the change of Cv (specific heat at constant volume with change in...

Apr607 05:51 PM
Gordon Arnaut

6 
12,732 
I've been working on a simulation of a Lorenz Waterwheel, and friction was killing it  I couldn't use realistic...

Oct3111 03:47 PM
berkeman

14 
12,721 
I am following the book 'Introduction to Electrodynamics' by Griffith. In that book,the magnetic field outside an...

Apr2507 11:42 PM
Coto

17 
12,717 