Vibration formulas
What are the relationships between frequency, amplitude (double) and acceleration?
View ArticleEffect of media on electric foce
I was thinking about the following: Assuming that you have NON SPHERICALLY SYMMETRIC charges and they are both in medium 1. Does it make a difference(whereby I am referring to the total force between...
View ArticleElectric field and electrolytes
Let me assume, that I have an arbitrary electric field. Is there any way to determine what happens to this electric field if it is appolied to a charge in let me say water with natrium chloride in it?...
View ArticleMoment of Inertia of mass
Hello, I am trying to find moment of inertia of various random 3D shapes and I have few general questions. I take very thin 'plates' of the shape, calculate moment of inertia of that area, multiply it...
View ArticleWork done by gas expansion
In my textbook W=∫p.dV is only proved for a syringe with a piston. This is quite easily done but the book never explains how it extrapolates to the general situation for a gas expanding in any...
View ArticleClik here to view.
How did they get this precession frequency of this gyroscope?
To summarize: 1. The solenoid is supplied with an AC voltage. 2. Produces an AC magnetic field out of the page 3. Exerts an AC magnetic force on the Nb-Plate that's placed just outside of one end of...
View ArticleDerivation of PEcos(θ) for diploles in constant Efield?
I know that the potential energy of a dipole in a constant electric field is P(dot)E=PEcos(θ), but I cant seem to find how they got here; its not in my textbook. If anyone knows why please tell me.
View ArticleProperties of this electric field
I have the following vector field:[itex]E=E_0(-sin(\phi),cos(\phi),0)^T[/itex] and [/itex]E_0[/itex] is some constant. Does anybody here have an idea what this electric field does to a metallic sphere...
View ArticleMagnetic length of a bar magnet
We just started magneto statics in school and were told about the use of magnetic monopoles for problem-solving reasons. So we were told that the magnetic length of a bar magnet differs from its...
View ArticleFundamental relationship between thermodynamics and stat. mechanics
From the Greiner (Thermodynamics and statistical mechanics) on the relationship between the number of microstates of two systems and the total entropy: ...for two statistically independent systems the...
View ArticleCharge screening by electrolytes
if I have a not necessarily homogenous electric field of a charge distribution in an electrolyte and i want to find out what the electric field at some position in the electrolyte is. is there any...
View ArticleFloating and Sinking in a Liquid
This seems to be a relatively simple question, yet I'm not sure of the answer. A balloon filled with helium gas floats in air. If I submerged a balloon or container in a liquid (e.g. water), is there a...
View Articlepolarizability if a molecule in raman scattering
Hello. I'm reviewing background information on Raman scattering and I've noticed that the polarizability scales with v+1 for Stokes transitions and v for anti-Stokes. Why is this and what assumptions...
View ArticleUpward force on a object spinning on on string
Hi everyone, I was wondering what forces would counteract the force of gravity on an object which is spinning horizontally on a string. I realize its a component of the tension, but how does the force...
View ArticleWhy does the speed of the water wave decreases as depth decreases?
Why does the speed of the water wave decreases when the water wave approaches the shallower region? Is it because of the frictional force between the water molecules and the seabed? I have searched the...
View ArticlePositive source for electromagnetic energy
We know that the conservation of electromagnetic energy is expressed via the continuity equation below: [itex] \large{\frac{\partial u}{\partial t}}+\vec{\nabla}\cdot\vec{S}=-\vec{J}\cdot\vec{E}...
View ArticleElectric field in two materials
Hi Does anybody know how to find out the potential energy of two equally heavy, equally big and equally charged particles that are placed at the boundary layer of two different media(for example such...
View ArticleEntropy and the Closed System
So in my physics textbook, the 2nd law of thermodynamics stated in terms of entropy reads "the entropy of a closed system can never decrease." Now, shouldn't it indicate the entropy of an isolated...
View ArticleCalculating Moment of Inertia (2D rectangles)
Hi everyone. i'm presently improving a 2D physics engine i wrote, with angular dynamics. Moment of inertia is becoming a big sticking point for me. However, given that my applications are fairly...
View ArticleHollywood Nonsense: Is it possible to "overcome" the square-cube law?
I'll admit up front: my knowledge of physics is sub-fundamental. If any questions I ask seem braindead ignorant, know that it comes from a genuine lack of understanding. Apologies in advance. For those...
View Article