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Again, for some odd reason, people...

Apr2211 05:26 AM
ZapperZ

1 
41,758 
I'm working on a project for myself in regards to atmospheric reentry. I've come across some equations that describe...

Apr914 08:41 PM
Rd123

11 
762 
I have never dealt with moment of inertia before, this is a physics lab i need to do some pre planning for which...

Apr914 02:17 PM
cooev769

8 
224 
I am currently working on a robotic manipulation problem and need to form a model for how an object responds. I start...

Apr914 09:14 AM
Liferider

1 
174 
Suppose that we have a body that is moving at a straight line, inertially wrt to another frame. If it starts to move...

Apr914 07:58 AM
Andrew Mason

9 
190 
Where does ohmic resistance arise from, is it from the collision of the current with the electrons of the wire or is...

Apr914 07:57 AM
nasu

19 
386 
Hi everyonefirst post, thanks for any guidance if I've posted in the wrong place.
I've got a simple idea and I'm...

Apr914 05:08 AM
Bobbywhy

7 
221 
This is not schoolwork.
Imagine that light did not have a constant speed, but behaved in the manner expected from...

Apr814 11:37 PM
Simon Bridge

1 
169 
Hi everyone.
I've been having this discussion with a pal regarding what affects the grip of a motorcycle's tires...

Apr814 11:17 PM
tduell

11 
1,566 
Hello there,
If a mass, m, is placed at one end of an boat of mass M, which is located on a frictionless ocean. If...

Apr814 12:58 PM
Matterwave

1 
167 
Hi there,
first, thank you for letting me posting here and hopefully helping me with this.
I am trying to model...

Apr814 10:29 AM
nrq

0 
155 
According to this website, there is an equation obtained empirically to obtain the amount of time it takes to cook a...

Apr814 08:30 AM
gmax137

3 
185 
I played around in another thread with mathematically determining where a car should be time wise on 1/4 mile run. I...

Apr814 04:28 AM
jumpjack

6 
276 
in a cyclotron the radius of the path of electron increases.but how if the velocity of the electron is accelerated its...

Apr814 03:59 AM
smart_worker

5 
344 
hey guys, can someone explain me Poiseuillie's law, because, I'm reading and reading and reading and don't understand...

Apr814 01:38 AM
SarcasticBunny

4 
177 
I have pictured I model about how electrons move in a circuit,
What happens first is that electrons are built up on...

Apr814 12:03 AM
jlopezfis

3 
214 
Hello everyone,
I want to have a simple example of an inductance calculation.
The magnetic field normal to a...

Apr814 12:00 AM
jlopezfis

2 
141 
So, I have been studying angular velocity and linear velocityand I want to use this information determine if a ray...

Apr714 11:08 PM
Simon Bridge

7 
222 
This relates to the extension of a uniform crosssection, homogenous, ideal wire which extends within the proportional...

Apr714 10:01 PM
kirakun

6 
203 
I am currently working on an experiment with piezoelectricity and was wondering how I would measure the force applied...

Apr714 05:38 PM
themadquark

3 
177 
Hi,
I was wondering what the frequency of a photon is according to maxwell's equations. Does the...

Apr714 05:04 PM
Drakkith

24 
758 
Dear Engineers,
My name is Humza Afaf and I have recently started a new business in Pakistan. Due to energy crisis...

Apr714 02:39 PM
humza_afaf

0 
127 
Hi! I have been studying AC generators. I am confused about why there is no current when the armature is...

Apr714 02:07 PM
jtbell

4 
174 
I have a quick question regarding causality in SR and some specific examples. Collision between two bodies is one of...

Apr714 11:03 AM
DaleSpam

10 
450 
Hello :smile: !
Let \mathbf{E}_1, \mathbf{H}_1 be an electromagnetic field due to certain sources \mathbf{J},...

Apr714 08:21 AM
EmilyRuck

0 
112 
According to Faraday's Law a changing magnetic field induces an electric field, an example of this is if you have a...

Apr714 08:18 AM
nasu

3 
162 
Sorry, but this will be a long post.
This isn't homework, I'm reviewing physics after many years of neglect.
...

Apr714 06:00 AM
jbriggs444

8 
347 
Imagine I am standing but not moving forward/backward, but I am rotating my body about my own axis. Now imagine if I...

Apr714 12:20 AM
UltrafastPED

1 
146 
I am not well versed in complex physics (I've taken honors physics in High school) so any help I can get with simpler...

Apr614 11:08 PM
WannabeNewton

6 
247 
How come a spring with applied weight of 1000 g goes down 9.8 cm but the same spring with applied weight of 500g goes...

Apr614 08:16 PM
jtbell

2 
157 
Hi
so I am trying to find the analytic solution for the steady state temperature distribution of a 2D plate which...

Apr614 05:24 PM
jancorn

0 
105 
Consider a solenoid of length l, no. of turns N, n = N/l, area A, and negligible resistance. In its middle is placed...

Apr614 04:17 PM
rude man

8 
227 
http://www.physicsforums.com/attachment.php?attachmentid=67782&stc=1&d=1395173030
Consider the following setup (see...

Apr614 01:26 PM
DaleSpam

54 
1,349 
Greetings,
I fell upon a certain question and it seemed that no matter what I did I was unable to solve it. I wished...

Apr614 10:08 AM
nasu

11 
284 
Hi all,
as already implied by the title, I'd like to compute the entropy of an ensemble of particles in a...

Apr614 08:47 AM
herrkami

0 
124 
Given a system's Lagrangian, How can we calculate the equilibrium points corresponding to the system? also how can we...

Apr614 08:12 AM
dauto

1 
129 
Greetings,
I was thinking about bouncing a tennis ball against a wall and how its momentum and kinetic energy would...

Apr614 02:10 AM
drichard

4 
135 
Hi, does somebody know a good website with many exercises about Lagrangian/Hamiltonian mechanics? And I mean problems...

Apr614 01:47 AM
UltrafastPED

1 
149 
Suppose we have two colinear strings under tension, attached far away, and with propagation speed v. Let the strings...

Apr514 03:38 PM
Spinnor

0 
165 
As I understand it, The intensity and extensive thermodynamic system parameters can only be internal parameters. The...

Apr514 01:38 PM
yuiop

6 
211 
It is said that in an isobaric expansion of a gas pressure remains constant throughout the expansion process.
...

Apr514 11:43 AM
yuiop

4 
171 