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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
ZapperZ
1 41,786
At parity of maximum resistance before failure (in the case of aluminum, deformation), weighs less aluminum or...
Aug9-13 10:01 PM
Aero51
4 501
Hi all, i have a doubt. How much teeth in relationship to his radius need to have a gear to be optimal? And, if i have...
Sep18-13 09:57 AM
SteamKing
2 285
If newtons third law says there is an equal and opposite reaction how can there be energy transfer. For example if I...
Apr30-13 09:34 PM
SammyS
4 1,105
For example if I punch an object and it doesn't move, am I giving it energy, if so after doing that billions of times...
May1-13 05:16 PM
FireStorm000
3 505
We find in the literature the following relationships between electric field E and magnetic field B B(z)=E(y)V/cc...
Jul11-07 10:52 PM
bernhard.rothenstein
4 22,904
Consider please a conducting wire located in a plane electromagnetic wave propagating in the positive direction of the...
Jul13-07 12:58 PM
bernhard.rothenstein
2 1,559
Defining the period measured by a moving observer relative to a stationary source as T=t(n)-t(n-1) where t(n) and...
Aug30-07 04:19 AM
bernhard.rothenstein
2 3,139
Consider please that an observer is located in a plane sinusoidal and polarized e.m. wave. He erects a metalic antenna...
Mar7-09 08:24 AM
clem
2 919
Consider the following statements: 1. If you move relative to me with velocity V I move relative to you with velocity...
Mar8-09 12:57 PM
bernhard.rothenstein
5 833
Many sources on basic gravity, like this quote from Wikipedia, say: “In the case of a spherically symmetric mass...
Oct3-10 05:04 PM
Bernie G
16 1,504
This is problem from a text book whose solution I don't understand. A small rock of mass 0.5kg is attached to a...
Jun10-12 02:16 PM
BERNIE649
5 1,390
I have a basic question regarding black body cooling. Suppose a person at sea level on a clear night, were to use a...
Jul20-07 08:33 PM
mgb_phys
8 2,300
Ok, so I have a 405nm laser pointer (bluish purple/uv). Had a few miscellaneous glass objects and was shining it...
Mar11-14 02:37 PM
BernieM
15 455
Hi, I just need to ventilate and see your opinions. Charge can be partitioned into groups of particles of one or...
Oct26-13 04:29 PM
DaleSpam
11 789
Can we make a car or vehicle that can ride on the earths magnetic field here within the earths atmosphere?
Jun7-10 11:13 AM
bcrowell
1 583
Hi there! I have a question, I am trying to find the critical point of a phase transition. For example in the Ising...
Nov11-13 04:37 AM
Bersling
0 274
Suppose that we will proof the continuity of the first maxwell equation: So we have div(\vec{E})=\frac{1}{\epsilon...
Nov3-07 09:46 AM
Bert
2 2,302
Where can I find online a good set of rigid body dynamics exercises? Thanks.
Jul19-08 06:05 AM
Bert
2 1,206
This is a question which I have been been tossing around for some time. By looking at gravitationally induced...
Jan8-11 10:32 AM
hermitme
6 5,059
I'm designing a paddle wheel drive house boat and need to do some calculations to see if the parts I have on hand can...
Aug19-09 03:32 PM
bertbcfm
0 3,531
I am attempting to design a base to support a post that will be pulled horizontally at its top. A 2D image of the...
May3-12 05:12 PM
BertSmurf
7 2,840
Could someone show me the simple formula, showing how quickly an item sinks in water. Presumably the formula...
Jul17-08 11:59 AM
bemortu
4 2,781
if i am finding the equipotential lines by using a conducting sheet, power supply, and muiltimeter to find the...
Sep24-07 06:43 PM
Claude Bile
1 3,463
In 3-D dynamics why is the angular momentum not aligned with angular velocity? Does this mean H = Iw is wrong in 3-D ?
Nov14-05 02:11 PM
BobG
2 2,240
let us consider a charged body is connected with a massless spring. the system is connected with wall. Now the spring...
Nov19-04 05:35 AM
besiktas_1
0 912
Hi Everyone; I hope this is the right forum. Here's the issue... with fixed pitch propeller aircraft, thrust is...
Nov16-08 10:30 PM
bestpa
16 2,050
Hi Can anyone tell me the differences between normal light (waves of the EM spectrum, i.e. visible light, gamma...
Feb9-06 05:57 PM
Claude Bile
5 1,459
Block 1 has a mass of 2kg and is moving to the right on a frictionless surface at 10m/s. Block 2 is ahead of Block 1,...
Jul17-13 03:22 AM
tiny-tim
6 608
A ball is attached with a string on the side. When the string is pulled up, static friction accelerates the ball...
Aug17-13 08:56 AM
bgq
7 774
The formula of friction force is Ff = μN can also be defined as Ff = μ.m.g One of my friend say that...
Jan22-11 03:21 AM
Alvasin
4 2,577
I was reading Goldstein's Classical Mechanics vol.2 to brush up, and didn't get far before I got stuck. The book warns...
Aug15-11 08:48 PM
clem
5 1,821
I feel like I am just plugging into equations when I solve physics problems and I dont know how to be creative in my...
Nov11-08 06:36 AM
clem
8 2,803
i need help on a physics project that is due tuesday. the objective is to use a small solar collector to collect...
Jan12-04 03:56 PM
pallidin
3 1,570
A few friends and I built a wave "machine." It's made by laying out brass "rods" about a foot long next to each other...
May23-08 08:49 PM
bfr
3 4,912
I'm kind of confused about how tension works. For example, If I had two blocks that massed 5kg hanging on either...
Feb10-09 02:15 PM
Archosaur
1 686
When exactly are they conserved? For example, one question involved a person jumping off of a circular platform...
May10-09 06:41 PM
Cantab Morgan
3 4,161
Hi, thank you for reading this topic. This is something that really bothers me...First of all let me say that I...
Oct18-12 04:09 PM
Studiot
8 3,293
I found via this forum the hint to use the inverse squared equation to differentiate to find the resonance frequency...
Jul28-11 10:29 PM
bgc
4 1,979
This is a similar answer to a closed thread, which asked for the amplitude of a pendulum as a function of the bob's...
Jun25-13 05:36 PM
bgc
0 259
Hi, I'm trying to calculate theoretical energy generated by a system and I'm not sure if I'm doing it right and if...
Feb21-13 01:00 PM
bgizzle
9 682

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