Point of application of resultant force from bound vector forces
Hello Forum, in the case of two or multiple free vectors, it is easy to determine graphically (head-tail rule) the resultant vector (magnitude and direction). The resultant vector is also a free...
View ArticleWhy in Optics total internal reflection happens this way?
why total internal reflection happens only when a beam of light travels from a medium with higher index of refraction to a medium with lower index of refraction and not the other way around (i.e from a...
View ArticleChanging equilibrium point in damped simple harmonic motion
Hi I have a damped simple harmonic motion model and I am altering the input force along with spring constant and damping constant. I can change the damping and spring constant to allow it to oscillate...
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Derivation of ideal gas equation
Is the following approach used for the derivation of the ideal gas equation correct? Here's the link: http://www.mikeblaber.org/oldwine/ch...as/Gases04.htm Attached Images screenshot-www.mikeblaber.org...
View ArticleInsulating a cat house
Hi, I'm trying to build a cat house and I thought I would calculate the exact thickness of insulating material I would need in order to keep my cat toasty when it gets cold. I'm not sure if I have the...
View ArticleA spherical conducting shell in an electric field field
If a spherical conducting shell is kept in an electric field (say, from a point charge kept at some distance outside the shell), will any charge be induced in the internal surface of the shell? Also...
View ArticleHow can i make a simple and practical particle accelerator.
Hallo everyone! I would like to make a small and simple particle accelerator that a) looks good and b) works. So if you could guys help me i would apriciate it alot! Thanks in advance. Christos...
View ArticleSmall mass element for laminar (moment of inertia)
Hi, I was just going over the moment of inertia for a 2D lamina, Ive been happy with writing the small mass element dM as dM = ρdxdy where ρ is the area density, but for some reason decided on doing it...
View ArticleMagnetic Force - HELP please!
Two parallel wires have charges moving in the same direction. Is the force between them attractive or repulsive? If so, why is it attractive or repulsive? Please answer me in details so I can...
View ArticlePhysical Interpretation of EM Field Lagrangian
Using differential forms and their picture interpretations, I wonder if it's possible to give a nice geometric & physical motivation for the form of the Electromagnetic Lagrangian density? The...
View ArticleInterpretation verification: Partition function vs. number of states
Greetings, I have been studying stat mech lately, and while I have gotten good at using partition functions to solve problems, I wanted to check my interpretation of what a partition function is, and...
View ArticleAmpere's Law when applied to a toroid
It's a simple question: Why is Ienc in Ampere's Law in a toroid equal to µ0NI where N is the number of loops around the toroid? Why is I N times greater when the wire is looped around the toroid? When...
View ArticleLaunch Advantages in the East Direction?
I have read numerous explanations as to why it is beneficial to launch a rocket in the eastern direction. I know that it's true because NASA's website http://spaceplace.nasa.gov/launch-windows/en/ even...
View ArticlePlasma assumed as a perfect eletrical conductor?
(Wasn't sure on the right section for plasma physics, I apologise if this is wrong). I'm reading up right now on a plasma surrounded by a tokamak wall, and the assumption of ideal magnetohydrodynamics...
View ArticleImpact of magnetic field on a "dirty" plasma.
This follows on from an earlier post of mine, which is now closed. I can also now disclose that it refers to my UK Patent Application GB1312183.5, which claims (in essence) that a linear motor can be...
View ArticleWhen to use gradient and when to use only one coordinate
Hi, I was wandering, sometimes in physics, to get acceleration from a velocity time graph, you would have to find the gradient of the tangent of the curve. But in other graphs like say Voltage current...
View ArticleScreened potential
Can anyone give a derivation for the screened potential of a point charge in a plasma in 3 dimensions? Thanks
View Articleproton's acceleration
Using the Coulomb's law, the force between two protons inside a nucleus is about 14.4 N Isn't that a colossal force for such a tiny particle?. I guess that shows how strong nuclear force must be to...
View ArticleHow to compute the energy of scalar wave equation
Hi, considering the scalar wave equation $$ { \partial^2 u \over \partial t^2 } = c^2 \nabla^2 u $$ (where ∇^2 is the (spatial) Laplacian and where c is a fixed constant) how can I derive the potential...
View ArticleI need the parametric equations for a simple pendulum.
This is for a personal engineering project. I need the parametric equations y(t) and x(t) for a very simple pendulum. Assume no friction, no forcing, no variation in gravity, a point mass, and the...
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