Ionized Air Flowing Through A Magnetic Field
So I'm going to try to explain this as best as I can. If you have ionized air created by the Ion Air Jet (link below) and it flows through a magnetic field, will the air accelerate? I'm trying to think...
View ArticleUniform Field & Poisson equation Mismatch?
Hi, I'm getting some confusing results and cant figure out what is wrong Suppose we have a uniform field [itex]E=[0,0,E_z][/itex] in a dielectric media. By [itex]E=-\nabla\psi [/itex] we can deduce...
View ArticleTwo questions on acceleration and an experiment
Hi. First post here and not a native english speaker, so be kind :-) 1) I have never really understood what it means when we say that the gravitation accelerations is 9,82 m/s2 What is the practical...
View ArticleCan extremely charged objects simulate some black hole effects?
If we had a positive point charge of incredible quantity, does there exist an imaginary sphere about it, such that regardless of the initial speed and direction of any electron, that electron could not...
View Article[fluid dynamics] are they trying to use the ideal gas law for LIQUIDS?
In my course they're using the equality [itex]U = \frac{p}{\alpha \rho}[/itex] with alpha some constant (U = internal energy per mass, p = pressure, rho = density). They explicitly derive it for an...
View ArticleOptical Radiation
Assume you have a sinusoidal 500THz function generator and assume you have a compatible antenna. If you feed the signal to your antenna, is optical phenomena observable ?
View Articlea question from from thermodynamics
I was doing chapter named kinetic theory of gases from a book. here's the question. A mercury monometer consists of two unequal arms of equal cross section area 1 cm^2 and lengths 100 cm and 50 cms....
View ArticleEnergy conservation for a point at the Earth's surface
Hi everyone, This is my first post here and I am really sorry for that question, but I have found the answer nowhere. Consider a mass at the Earth's equator that is static in the Earth's referential...
View ArticleFactors affecting motorcycle grip when turning
Hi everyone. I've been having this discussion with a pal regarding what affects the grip of a motorcycle's tires when turning and I was hoping someone in here could enlighten us :) So, we have a...
View ArticleSpring hanging from ceiling
I have a question that's being bugging me around. This might be simple but I can't figure it out. If there's a spring hanging from the ceiling and we want to prove that there's a Simple Harmonic...
View ArticleTransform Maxwell Equations into k-space
Dear fellow physicists, looking at the derivation for the maxwell equations into k-space, I've stumbled upon something that seems not so logical to me. It is concerning the two parts where they...
View ArticleMagnetic confinement and Alfven's theorem
Hi, I was reading about Earnshaw's theorem and how it explains the non availability of electrostatic confinement of plasma, but does Alfven's theorem really prove the fact that magnetic confinement of...
View ArticleWhy are the products of sound wave lengths and frequencies always constant?
Hi everyone! I was reading a text book a while ago about waves and it had just finished talking about wave speeds and how it is the product of the frequency times the wave length. On the next page, it...
View Articleis acceleration always positive
Hi, Acceleration is defined as the change in velocity over the time interval. Is acceleration ever negative, or is it always positive? If I were to throw a rock up in the air, is it always accelerating...
View ArticleContext Rich Problem: Thermodynamics: How much ice?
How do you solve the following problem: You are in charge of keeping the drinks cold for a picnic. You have a styrofoam box that is filled with cola, water and you plan to put some 0° ice in it. Your...
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Electrostatic potential with floating metals:computation and measurement
Hi all, I am considering the situation illustrated in the schematic below. A surface density of permanent charges σ is embedded into a dielectric (with relative permittivity εr) itself sandwiched...
View ArticleMotion: Why we need acceleration??
Hi guys!! While studying motion of any object we need displacement (say, x) of the object(to locate the object from some reference)to describe it's motion at any time instant. Next to compare the...
View ArticleMagnets/ Magnetic fields energy storage?
Very strong magnets like neodymium can create a very powerful force! I wonder the amount of energy supplied when there created to be magnetized, in a sense don't they store energy and it is...
View ArticleApparent paradox with angular and linear motion
A friend raised an observation which I thought would be easy to explain. But it seem I have a gap in my physics knowledge... An object (rigidbody) is stationary in zero gravity empty space. In the...
View ArticleMoment Of Inertia (calc vs physics different answer)
I'm trying to understand Moment Of Inertia using integration. But it seems the calculus definition of physics definition are different. (I'm trying to apply my math skill to physics) example of...
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