Magnetic fields and charged particles
Hi, just reviewing some of my physics material, and realized I had a question that has never been answered for me. I know that charged particles, traveling parallel to a magnetic field, feel no force...
View Articlemeasuring the electrical conductivity of the atmosphere
I am trying to devise a way to test the electrical conductivity/resistivity of the atmosphere through rising altitudes. The platform for the experiment is a NASA weather balloon with the allowance of a...
View ArticleSolved problems of Thermodynamics?
Hello everybody! This is my first thread and I'm just kind of discovering the forum. If I should make a presentation or should have posted this thread somwhere else, let me know please! I have plenty...
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Static failure analysis of a pin
So i am confused on how to do the analysis on the pin where the hook attaches to the arm. would their be a shear and a torque at that point?
View Article¿ What is Heat
¿ What is heat, really, is the energy that in summatory of energies can´be written in function of temperature? It appears in primitive formulations of first principle of thermodynamics, but I don´t...
View ArticleFree body diagram - Weight and normal reaction
Let's consider a stationary ball lying on the floor. The weight of the ball acts downwards and the normal reaction acts upwards. They are of the same magnitude but not of the same type. So normal...
View ArticleDoes a current carrying wire attached to a magnet generate a force?
I have a bit of a theoretical question. If one has a current carrying wire in a magnetic field such as in an electric motor rotor, does the resulting force on the wire also impart an opposing force on...
View ArticleWhat exactly is this resonance curve showing?
Hi I had a quick question. From what I understand resonance is when a natural frequency of an object is matched by the driver frequency however in this graph it seems as though resonance is occurring...
View ArticleFind acceleration to stop at target in frictionless 2D space
This is a problem that's appeared in a game I am writing, and is a bit beyond the mechanics I can sort-of remember from highschool. The context is I have an object in 2D space which has a position...
View ArticleCan COMSOL generate an unpolarized radiation?
Hi, I am wondering if it is possible to generate unpolarized light using the RF module in COMSOL (I have version 4.3). I haven't found any option in the Electromagnetic wave block of my physics...
View ArticleSurface Charge on Resistive Current Carrying Cylinder
The goal is to find a reasonable solution to the surface charge density that would cause constant current through a cylinder of constant resistivity. One approach is to attempt to find a surface charge...
View ArticleMechanics of a Large Chest in Space
At the moment, I am reading the book Relativity, written by Albert Einstein regarding his special and general theory of relativity. In his introduction to general relativity, he poses a thought...
View ArticleLCD cell thickness - why is this restricted?
Hi, I have read loads on LCD operation and in particular NT-LCD and understand the twisting of the light by the LC. Everywhere i read it states that "the thickness of the cell is crucial for correct...
View ArticleIs additive color mixing a linear process?
Is additive color mixing a linear process (or close to)? (if this question has already been answered in detail, please forward me) If the answer to this question is "yes" then: Considering three...
View ArticleHow to calculate the magnetic dipole moment?!?!
Does anyone out there know how I can calculate the magnetic dipole moment of a simple bar magnet? Or any kind of magnet? Without using this formula: [itex]\tau[/itex] = μ x B
View Articlea quick question about thermal dynamics and books
hey all so i am taking a class on thermal dynamics this summer and am using Kaminski's "Introduction to Thermal and Fluids Engineering" i learn very well if i have a solutions manual to a book, but i...
View ArticleDeceleration of a projectile (With air resistance)
Hi there, sorry for asking a question as my first post instead of contributing to the community however I have a problem which I just cannot seem to find an answer to. I am trying to model the flight...
View Articlemass gets cancelled out on downhill slope
I'm looking at a general problem in which a skier is going downhill. I understand 'mathematically' how the mass will cancel out of the final equation when calculating the acceleration, but I don't...
View ArticleHow to use ballistic coefficient (SI units)?
Reading in Russian sources I see they use ballistic coefficients such as these: BC = 3.0 kg/m^2 or alternatively BC = 3.0 m^2/kg That's quite different than the usual G1, G7, etc. Given a certain...
View ArticleNegative Temperature
I've read recently about systems with the ability to reach negative temperature: where entropy decreases as energy increases. I have a couple question regarding this. First, how is it possible to reach...
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