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

Apr2211 05:26 AM
ZapperZ

1 
47,852 
First off I would like to say that this is not a homework question. I am trying to calculate the temperature of a...

Apr2508 09:33 AM
Mapes

2 
3,701 
In reading Feynman's "Lectures on Physics", volume 2 I have a question and have included a scan of a small section...

Apr2508 08:26 AM
Thomas2054

4 
1,784 
Hi,
I am doing simulations on a particle in some potential together with a fluctuating force and friction. To do...

Apr2508 01:57 AM
shad0w2000

0 
1,291 
Hello I really want to know what the advantages and disadvantages of optical pyrometers are?
Thanks a lot

Apr2408 08:15 PM
Redbelly98

2 
3,664 
Hello hello,
I cannot for the life of me wrap my head around the idea of a boundary condition. I...

Apr2408 07:06 PM
Lojzek

3 
3,123 
Suppose that I have an aluminum cube with side lengths 10 cm. Suppose that I uniformly and continuously apply a...

Apr2408 05:26 PM
GT1

14 
3,215 
hi!
Actually am learning Lenz's law but am just getting confused.i know that the change of a magnetic field around a...

Apr2408 05:08 PM
mikelepore

4 
1,754 
Recently I was helping a friend of mine nail sheets of felt on a roof, and we finished applying the felt in the...

Apr2308 11:42 PM
Phrak

18 
6,249 
hello
In a textbook it is stated that if a piston of a gas syringe is used to compress the gas inside. Its Potential...

Apr2308 06:51 AM
ay2k

4 
1,928 
I am looking for educational derivation( or any available and detailed) of the key principle of statistical...

Apr2308 01:28 AM
bilha nissenson

12 
2,493 
A conducting ball of radius R and total charge Q is placed in a homogenous electric field E. Find the potential V...

Apr2208 03:33 PM
pam

2 
1,090 
Hello.
When a capacitor is connected in a circuit with an ac supply, a current flows in the circuit. fine. The...

Apr2208 02:07 PM
ay2k

9 
15,589 
Hello,
I have a question about how balls react on collision while having diffrent mass,
lets say two balls are...

Apr2108 02:30 AM
Shooting Star

5 
1,623 
As water is pulled into an opening by gravity, it begins to spin. Why does it spin?

Apr2108 01:34 AM
kamerling

34 
9,625 
i cant figure this out. In an RC circuit, why is the maximum voltage of a capactior greater then the maximum voltage...

Apr2008 03:36 PM
kamerling

1 
928 
suppose you have a solenoid with hollow core connected to a galvanometer.
On one side you have a SN magnet (ie....

Apr2008 04:59 AM
genneth

3 
1,657 
is it possible to continuously change the acceleration of light?

Apr2008 02:52 AM
rcgldr

11 
1,582 
Hi!
I am studying the diffusion of CO2, can anyone tell me the value (or/and any references) of the diffusion...

Apr2008 12:23 AM
Crazy Tosser

1 
4,101 
Why is it that on a hot day, you can see a cars reflection on the road. What is this called?

Apr1908 03:51 PM
Danger

2 
3,175 
Does anyone know where I can find a derivation how/why a light beam disperses? I'd like to see some sort of solution...

Apr1908 06:18 AM
pinestone

6 
4,872 
Many things have an infinite source of energy, where it isn't CONVERTED from other forms of energy, nor mass. Namely,...

Apr1808 06:07 PM
pmb_phy

43 
5,421 
I was thinking about newtons law and come across something interesting. F=ma=GMm/r^2
therefore a=GM/r^2. This is...

Apr1808 08:52 AM
DavidWhitbeck

10 
1,948 
"The number of magnetic lines of force passing through any area in a magnetic is known as magnetic flux" So the...

Apr1808 05:41 AM
Shooting Star

9 
11,518 
Hi all
Not sure if I posted in the right spot but my question is in regards to optics and projection. To make a...

Apr1708 09:28 PM
rotor_hed80

6 
1,530 
How to calculate the rotationals and torque forces on a hydraulic cyclinder, which is on a 14" arm welded to a 3" o.d....

Apr1708 03:57 PM
Windseaker

0 
1,149 
I was doing an experiment to determine the capacitance of a capacitor in a circuit with a particular resistor R. This...

Apr1708 10:55 AM
Redbelly98

10 
3,154 
How can I calculate potential enegry?
I have a interpretation about it, we should use the work that the string...

Apr1708 10:42 AM
Redbelly98

1 
6,592 
I have a problem in trying to express a net force equation for a falling elastic object when collision ensues.
For...

Apr1708 03:37 AM
benabean

1 
4,584 
scenario:
If any generator ultimately 'pushes' current (free surface electrons) down a wire, moving trillions of...

Apr1608 07:23 PM
russ_watters

6 
1,923 
y for all real vertical throw, the time taken to reach max height must b shorter than time taken to return to starting...

Apr1608 07:12 PM
indr0008

10 
5,113 
Hello,
I have a potential function given numerically at points evenly spaced. That is to say, I have the numerical...

Apr1608 02:41 PM
hattori

0 
1,174 
I found this problem in the book Resnick and Halliday many years ago (1992) and I had it in my mind until 2005 or so...

Apr1608 11:57 AM
Barfolumu

9 
1,505 
Wel, this is just crazy.
I've noticed something weird about spinning tops. Most of them start loosing speed, then,...

Apr1608 11:34 AM
wysard

5 
1,998 
Hi,
I'm a grad student in computer engineering and my research involves a fair amout of mechanics (forward/inverse...

Apr1508 04:48 PM
D H

17 
3,088 
Why is it that if an orbiting space station is observed to remain always vertically above the same point on Earth then...

Apr1508 08:35 AM
D H

6 
1,781 
Say you had a circuit with a battery and a loop of wire somewhere in the middle of the circuit. The loop of wire is...

Apr1508 06:46 AM
Redbelly98

4 
6,687 
What is cause of capacitor breakdown?
When we combine different capacitors in series and parallel combination, how...

Apr1508 12:59 AM
Phrak

4 
7,024 
I am a physics student just finishing my sophomore year, and i was looking into what i could expect in upcoming...

Apr1508 12:28 AM
Marthius

3 
1,354 
Is there such a thing in electrical circuits, or anywhere else? Or is this just considered reverse polarity, or 0V?

Apr1408 11:01 PM
nuby

9 
2,392 
Ok, dumb question, I know. But it's been bugging me, and I can't find a straight answer anywhere, so here it goes:
...

Apr1408 10:11 PM
Usaf Moji

2 
1,259 