Magnetic Flux and Potential
We are studying electrodynamics, more specifically magnetic potential. We are given B=∇xA I saw on a certain website here http://www.ittc.ku.edu/~jstiles/220/...0Potential.pdf that A=∇xB So is it true...
View ArticleNon-uniform circular motion formula
I'm trying to derive the formula for the tangential acceleration of a particle undergoing circular motion [itex]a_{tan}=r\alpha[/itex] using vectors in the same way you would for uniform circular...
View ArticleExample of x0 in the kinematic equation for displacement
In the kinematic equation x = x0 + v0 * t + .5 * a * t^2, can someone give me an example in which x0 has a value that is not zero?
View ArticleClik here to view.
An angular momentum conundrum
Here's a little thought experiment that highlights a problem I'm having with angular momentum. Here's my little experimental gizmo, spinning freely and leisurely in space. It has a hub and a pair of...
View ArticleCAlculate wind load using fluid impulse and momentum.
I recently took a crash course that included some topics in fluid mechanics. I learned that you can use the concept of impulse and momentum the calculate the force of fluid, for instance a jet of water...
View Articlewhy is the magnetic field inside an ideal solenoid uniform
I understand that the magnetic field at points inside the solenoid is the vector sum of the B field due to each ring. How can the field inside be uniform then since if you consider just one loop in the...
View ArticleProblem with energy conservation of mgh and 1/2 kx^2 (spring)
So I feel really stupid asking this, because this is a very elementary physics problem and I'm well past this level of physics, but I don't understand what's going on here. Say we have a vertical...
View ArticleEnergy a mathematical expression?!
So, energy is simply a mathematical expression of how much work is done in the system? Since energy is not a "physical" object that has mass. It's not matter at all. If so, the laws of conservation...
View ArticleWhy does current decay in an RL circuit?
I fully understand mathematically using differential equations and also using conservation of energy why current should decay in an RL circuit. However , I cannot comprehend how this phenomenon can be...
View ArticleDeriving differential equations for free rotation
I was asked to formulate the equations governing the rotation of a body moving without any external moments acting about its centre of mass in terms of a coupled system of first order, nonlinear...
View ArticleRope Climbing Device
Recently I entered a competition to join a club. The task is to make a "thing" that climbs a rope. The rope is about 1/2 a centimeter thick and it is graded on design, speed, and overall in general. I...
View Articlerelationship of simple pendulum
hi guys, I'm currently working on a physics report about a simple pendulum and cant figure out how to answer one of the questions: 3. "define all terms in the solution(x(t)=Acos(ωt)) and especially the...
View ArticleMIT OCW rocket question
The result found in problem 7.1 says that the velocity of the two stage rocket(v1 in the derivation in the link below) < velocity of a single stage rocket(v2). Am i misinterpreting the results since...
View ArticleAngular momentum in ElectroMagnetic fields(Feynman's Disk Paradox)
In Griffiths book, "Introduction to Electrodynamics" example 8.4 he calculates the angular momentum density for a set up that is a version of Feynman disk paradox. His answer for the angular momentum...
View ArticleHydrodynamic force of water droplet stated in psi at various mpg
I'm not a student of physics but do have puzzle I am trying to solve. Is there a way to calculate the force of a water droplet impacting a vertical surface stated in psi at various speeds of impact? A...
View ArticlePhase space. Phase trajectories.
If I understand well like in kinematics where we could have eq of motion ##x=x(t)##, ##y=y(t)## and we get eq of trajectory with elimination of time. In dynamics we have ##x=x(t)##, ##p=p(t)## and with...
View ArticleDynamics of a particle moving in a straight line
Hi all, Sorry if I have posted in the wrong place. I am not to familiar with the forum titles and new setting. I have an argument and this is not homework. Suppose two particles P and Q of masses 2m...
View Articlehelp with newton's rings concept
We've been working with Newton's rings in my physics class and I'm a little confused. All the explanations we've gotten only consider light that hits the bottom surface of some glass bowl and the...
View ArticleClik here to view.
Permittivity and conductivity
Hello everyone, I have seen an equation which relates conductivity with permittivity as follows in the attached image file. My question is how is this relation possible and are there any assumptions?...
View ArticleWhen is work done on an object?
Hi, this is my first post here. I have a degree in physics and i do some maths and physics tutoring. Recently I realised that I have some holes in my understanding of work, based on a question I was...
View Article