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- Principles developed before the rise of relativity and quantum mechanics. Mechanics, Electrodynamics, Thermodynamics, Optics...
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Before posting anything, please review the Physics Forums Global Guidelines. Again, for some odd reason, people...
Apr22-11 05:26 AM
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Consider a freely rotating body. Let the axis of rotation be the z-axis. For simplicity assume all the mass of the...
Sep2-12 02:57 PM
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Says Wikipedia: "The moment of inertia is a measure of an object's resistance to any change in its state of rotation"....
Sep2-12 09:46 AM
Simon Bridge
3 580
Hello everyone. I am fairly familiar with physics. However I have a question regarding the math behind a lever...
Aug31-12 06:20 AM
4 721
Was not sure where to post this specifically, but I am looking to calculate the possible distance traveled by by a...
Aug31-12 08:12 AM
6 877
Consider the Hamiltonian of Kepler problem H(\boldsymbol{r},\boldsymbol{p})= \frac{|\boldsymbol{p}^2|}{2\mu}...
Aug30-12 03:32 PM
0 404
Given the following instantaneous parameters and constants... Known: d = air density = 1.24 Cr = rolling...
Aug30-12 11:07 PM
6 1,216
Forums like these give me faith in humanity. I am busy with little project and I've just come out of angular...
Sep2-12 07:19 AM
The Sparrow
6 839
I had a thermal conductance homework problem where heat flowed through gold, and then silver. Both materials were of...
Aug30-12 04:31 PM
4 611
I'm a little confused about what exactly work/energy is. I understand that if I exert 10 N o a box over a distance of...
Sep1-12 12:31 PM
3 740
This page talks about how the battery does...
Sep2-12 08:33 AM
13 1,188
Hey I just wanted to check with y'all, but I feel I'm fairly well acquainted with momentum and the rules surrounding...
Aug29-12 02:53 PM
1 913
Here is a simple example about my issue with this. 1g ball (ball A) moving west at 10m/s hits another 1g ball (ball...
Aug30-12 07:49 AM
6 2,977
Hi everyone I have a quick question regarding heat transfer. I have yet to study heat transfer yet but I have a basic...
Aug29-12 01:56 PM
1 559
I have a question. All things being equal as far as flow and pressure goes...where would the gas preferentially flow...
Aug29-12 04:08 PM
14 822
I have only recently found out about this idea (many thanks m.e.t.a.) and I am curious about it. Could it be used to...
Sep1-12 03:38 PM
5 1,640
The cartesian sign convention for a convex lens is follows: 1. All distances on the principal axis are measured from...
Aug29-12 02:24 AM
Simon Bridge
3 517
Dear friends, In small oscillation problem of classical mechanics, the generalized force is zero (Eq. (6-1)) of the...
Sep3-12 03:55 AM
0 582
In the question I am not able to understand what the scenario is. Is it that we are removing the P force after...
Sep1-12 05:03 PM
7 992
I have an image taken with a camera. I know the f/#, focal length, CCD characteristics, and an approximate distance to...
Aug30-12 08:54 AM
Andy Resnick
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Hi, Im getting started on analytical mechanics but need some help understanding some of the things that is said in my...
Aug30-12 01:10 PM
19 1,086
How exactly does water behave in a magnetic field? I've seen pictures of a boat that uses electromagnetic rail...
Aug28-12 01:11 PM
5 781
The flux rule for motional emf can be stated as: d\phi/dt = -\epsilon I have some questions regarding this. 1)...
Sep3-12 03:51 AM
3 789
If I am trying to minimize triboelectric charging. What two substances when rubbed together would produce minimal...
Aug30-12 05:37 PM
2 893
I'm just confused... I know that magnetic fields can do work only on pure magnetic dipoles like a bar magnet. Based...
Aug31-12 07:17 AM
407 30,702
I need to calculate the torque needed to move an object in horizontal direction. The object is subjected to a force P...
Aug29-12 07:34 AM
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Hi I had a few thermodynamics questions on a thread that was locked. The link is here and my questions are directed...
Aug29-12 02:13 AM
20 2,175
I am not sure if this is wright section for this question,so please excuse me if a made a mistake. I am thinking of...
Aug29-12 02:27 AM
4 618
Consider a current loop with a switch and an AC source in space, there is a point charge(electron) inside this loop,...
Aug30-12 02:14 PM
34 3,145
Hello Forum, In kinematics we study motion and the trajectories of moving bodies. The trajectory is a line...
Aug28-12 01:56 PM
4 929
I need a review of solenoid equations, such as equations for bar solenoids, toroidal solenoids, and toroidal solenoids...
Aug30-12 11:09 AM
Prince Rilian
2 888
I'm interested in working out an efficient and precise numerical method to find the charge density on a conductor with...
Aug28-12 11:33 AM
5 903
I am trying to better understand some concepts in magnetism and I hope that someone here can help clarify a few...
Aug29-12 01:17 AM
3 785
Suppose a permanent bar-magnet is placed inside a toroid/torus and the toroid is then completed and power applied. How...
Aug28-12 11:09 PM
Simon Bridge
3 1,219
Here is a quote from one of the MIT notes on magnetism : "Note that F(magnetic force) is perpendicular to v and B ,...
Aug29-12 05:57 PM
9 966
Is it possible for a surface that reflects all visible light, and absorbs absolutely none to exist, Or would that...
Sep3-12 05:02 AM
Simon Bridge
11 831
Hi all, I've been looking at some buoyancy problems and one continues to vex me, how to calculate the new fluid...
Sep1-12 02:06 AM
1 933
Say an object is dropped out of a plane at height h above the ground and flying at a constant speed v0... Ignoring...
Aug28-12 09:10 AM
2 621
Assume we have an ideal gas of N particles inside a thermally isolated cylinder of volume V, and that the cylinder is...
Aug30-12 01:46 PM
6 1,703
hi ... These days i am trying to make sense of the various processes of thermodynamics and so far i have tried the...
Aug30-12 09:03 AM
3 751
Hey, I am helping out with a class and the students were given a question about an electroscope that is being...
Aug29-12 02:22 AM
Simon Bridge
3 892

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