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Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
47,003 
So today my brother and I were playing with a mini solar cell that I just got, watching the voltage change with a...

Sep812 10:46 PM
K^2

8 
1,108 
Hi guys, sorry because I am quite confused.
If a person runs a quartermile circular race track for 8 laps for 25.0...

Sep1012 06:40 PM
121910marj

8 
1,103 
I tried looking it up, but I just don't get it. Something about intensity going to infinite(?)
What exactly was the...

Aug712 04:53 PM
sophiecentaur

8 
2,521 
http://img826.imageshack.us/img826/2928/19002018.jpg
Suppose I have a slidewire generator as in the image above.
...

Jul1512 05:23 AM
Miyz

8 
4,100 
In electrodynamics,the density of energy and momentum of electromagnetic field is expressed by the intensity of...

May2512 10:47 AM
zhangyang

8 
1,428 
the potential difference between b and a is defined as follows:
V(b)  V(a) = ∫E \bulletdl
the integral is...

May2712 06:59 AM
platonic

8 
1,232 
Hi All,
First off, thanks to all the old hands at physicsforums, you guys are truly an amazing resource.
I was...

Jun812 08:24 AM
Jano L.

8 
2,212 
Hey guys!
I'm really stuck and would be grateful for any help. I'm a postgraduate researcher, though not a...

Jun512 01:53 PM
Studiot

8 
5,887 
In Carnot cycle we assume that heat addition takes place at constant temperature(temperature of system and source...

Jun612 11:25 AM
Studiot

8 
1,199 
Hello everyone.
I indeed like to understand the things I am learning, and for the love of me, I cannot understand...

Jun712 07:40 AM
carpetman

8 
1,682 
I have my introductory physics students determine the index of refraction of various solids using fairly conventional...

Jun812 12:15 PM
Vanadium 50

8 
1,231 
Hi there,
I have recently downloaded this document on magnetic generators. I would just like to confirm a most...

Jun1212 02:31 AM
barendfaber

8 
1,572 
Speed of sound at a specific temperature is independent of Pressure as Pressure varies directly with density.
So...

Jun2812 04:27 PM
Philip Wood

8 
5,119 
So im kind of a newb to Physics, I am currently studying magnetic field and I had a question to ask about this topic:...

Jul1212 03:50 AM
Simon Bridge

8 
1,259 
We all know that Newton's laws of motion are only valid in an inertial frame of reference.
Our earth is a rotating...

Jul712 11:57 PM
D H

8 
1,336 
Hi I'm wondering what properties affect the propagation of electromagnetic signals.
I am interested why an...

Jul1012 12:39 AM
the_emi_guy

8 
886 
Noob, apologies to all.
What is magnetic force? I can calculate it, and know that it is perpendicular to the motion...

Jul1212 10:35 AM
Morgoth

8 
1,297 
Consider the following theoretical cycle. There should be a flaw somewhere, but I could not find it yet and will...

Jul1912 01:37 PM
Ambforc

8 
931 
http://www.youtube.com/watch?v=69EzdOHHXc
A 100g weight resting on a scale took a ride in a lift. From the...

Jul2412 09:27 AM
pikachoo

8 
1,074 
Hi everyone.
I have the following question: on passivated copper sheets used under high electric fields I found...

Aug112 01:09 AM
ehild

8 
975 
I have difficulties in finding the true black carbons in a diamond from an image.
Since diamond has a high...

Aug912 11:02 AM
sty2004

8 
1,384 
Does anyone know the exact value of the highest frequency generated by man ? The waveform and amplitude doesn't...

Aug112 08:19 PM
bcrowell

8 
1,464 
When we talk about Snell's law, and total internal reflection in particular, we usually will draw diagrams as if light...

Aug312 02:19 PM
Drakkith

8 
1,088 
I'm reading my course book on ELectromagnetism and it is talking about a wave moving in the yz plane but with...

Aug812 07:19 AM
tomwilliam2

8 
1,319 
Hello everybody.
I have to admit that I feel quite troubled since long time, actually since I read the solution of...

Aug812 09:42 AM
mfb

8 
979 
3 masses 120 degrees away from each other each one of 46g is spinning at 600RPM 58mm away from the center and are...

Aug1112 03:12 AM
Vonnesy

8 
1,213 
I was given an oven that comprises of several cylinders that fit inside one another. The innermost cylinder is a...

Aug2112 05:23 AM
mfb

8 
1,482 
For the same material, same rectangular shape and the same length,
The wider one or the narrow one will switch their...

Aug1812 04:24 AM
kor

8 
1,031 
So I have learned that all batteries have an internal resistance which will limit the current that it can output, so...

Sep2912 02:42 AM
CWatters

8 
1,980 
I'm a high school physics teacher and I need a way to demonstrate net force = zero when something is moving at a...

Oct2112 01:53 PM
jamesnb

8 
1,521 
I've got a flywheel spinning at 850RPM. It weighs 112,34g and has a radius of 38mm.
I want to calculate the Kinetic...

Oct612 03:41 PM
CognitiveNet

8 
1,486 
Using taylor series expansion to prove gravitational potential energy equation, GMm/r=mgh at distances close to the...

Oct1012 01:16 PM
Nugatory

8 
3,230 
The function for simple harmonic oscillation is:
Acos(ωT)+\phi
Why is there an angle phi added to the function...

Oct1212 10:09 PM
CrazyNeutrino

8 
2,173 
Is there any known method to convert straight into electrical energy?
without all that 'steam' part? xD

Oct1512 08:10 PM
russ_watters

8 
950 
Why can't we fill the balloon with the lightest substance available, i.e. vacuum?

Oct1712 01:25 AM
cjl

8 
825 
Hi, thank you for reading this topic.
This is something that really bothers me...First of all let me say that I...

Oct1812 04:09 PM
Studiot

8 
3,546 
Hi,
Newton's 2nd Law can study the motion of the objects in the case of zero net force:
F = ma
if F = 0 then...

Oct2212 04:59 PM
russ_watters

8 
1,346 
Hello everyone,
I was wondering how could you determine the period of the motion of two or more coupled oscillators....

Nov1212 02:09 PM
omertech

8 
1,419 
Hello to the Forum.
I just started doing some very light weight lifting and decided to do a rough calculation of...

Nov1312 01:58 PM
DaleSpam

8 
1,987 
I am unsure how bathroom scales work. Does your weight compress or depress the spring? Do scales measure the upward...

Nov1312 08:56 PM
Conde

8 
1,148 