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

Apr2211 05:26 AM
ZapperZ

1 
48,237 
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 
1,548 
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 
1,154 
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 
3,166 
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 
6,616 
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 
4,594 
scenario:
If any generator ultimately 'pushes' current (free surface electrons) down a wire, moving trillions of...

Apr1608 07:23 PM
russ_watters

6 
1,934 
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 
5,196 
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 
1,186 
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 
1,520 
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 
2,016 
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 
3,113 
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 
1,793 
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 
6,707 
What is cause of capacitor breakdown?
When we combine different capacitors in series and parallel combination, how...

Apr1508 12:59 AM
Phrak

4 
7,114 
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 
1,361 
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 
2,411 
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 
1,268 
Given n (finite) point charges in the xyplane, is it possible to have a curve (in the plane) along which the...

Apr1408 06:05 PM
ZapperZ

10 
1,677 
Hey all, so i have a cylindrical 1.61 tesla magnet with pole orientations (+)_) being spun at 350RPMs in a...

Apr1408 04:11 PM
chassiz

0 
3,138 
So I know there is an upper cutoff frequency (at least in the microwave band) for a rectangular waveguide. However...

Apr1408 12:00 PM
lbrits

1 
5,812 
I PM'ed the admins for the best place to ask this question, but have not heard back so:
I would like to hire...

Apr1408 11:45 AM
Zack311

0 
1,531 
This has always bugged me, and I don't think that I've ever gotten a satisfactory explanation (even though it's a...

Apr1408 06:48 AM
resolvent

13 
7,286 
All right, so, we just went over linear momentum in school, and one thing is confusing me:
If I throw something at...

Apr1308 05:25 PM
Shooting Star

11 
2,490 
Hi everybody,
I have faced with a problem in my report. The question said that "How can ferromagnetic effect change...

Apr1308 02:30 PM
slayercantona

2 
2,339 
Hi, I'm doing a question about Boyles law, and I don't understand some of the units they are giving.
Initial...

Apr1308 11:40 AM
mdnazmulh

1 
1,298 
Today I was outside to get some grass for my rabbit. I took some yellow dandelions too, but as I entered the elevator...

Apr1308 06:39 AM
Tachyonie

3 
1,588 
Dear All
I have a problem that can be represented in two different forms.
Problem is related to propagation of waves...

Apr1308 04:31 AM
tinytim

3 
5,648 
surely \vec{\nabla} \times \vec{B} \neq 0 in general
but the work done by magnetic field on any charge is 0 hence is...

Apr1208 02:33 PM
genneth

6 
4,561 
What are electromagnetic waves supposed to look like in 3D?
Also, in the vacuum of space, electromagnetic waves...

Apr1208 11:09 AM
lbrits

19 
6,088 
Hi,
I have this question. If a diode were connected to a circuit with an alternating current and there was a...

Apr1208 06:35 AM
Icetray

1 
1,143 
In practice, the suspension system of a car consists of a spring under compression
combined with a shock absorber...

Apr1208 04:10 AM
tinytim

6 
4,104 
Hi guys,
In quantum mechanics, the virial theorem for a system in its ground state is proved by a very nice scaling...

Apr1108 03:48 PM
luben

1 
1,808 
Suppose I have 2 bodies, M1 and M2. Assuming that no other forces are acting on them aside from gravity, what is the...

Apr1108 11:34 AM
Ulysees

3 
2,821 
According to Bernoulli's law pressure and velocity along a stream line are related to each other.
What is the most...

Apr1108 06:25 AM
Astronuc

7 
3,748 
hello all,
I got a bit of a problem. I want to calculate the vapor density (kg/ m3 or lbs/ ft3) with the following...

Apr1108 01:46 AM
timvk

3 
4,173 
then that object would vaporize or cause a nuclear explosion. Atoms crashing into an object at the speed of light...

Apr1008 11:58 PM
Feldoh

4 
1,239 
Greetings,
Regarding a mass on a spring – I know the classic differential equation is
m \frac {dx^2(t)}{dt^2}...

Apr1008 03:32 PM
Sparky_

9 
1,762 
If two different masses, separated by a spring, are pulled apart, and then the spring is instantaneously release from...

Apr908 06:51 PM
grabbinghands

6 
2,992 
If a string is attached to a weight and swung around overhead, is the force that creates tension on the string...

Apr908 06:37 PM
DaveC426913

18 
3,018 
Can somebody please shed a little light on what this formula represents in the physical world?
And how could I solve...

Apr908 03:20 PM
hslilly

4 
1,433 