Potential of a Quadrupole (Far Away)
So we're currently covering multipole expansion techniques in my EDM class. The multipole expansion is a summation of integrals each treating a different configuration of discrete charges (monopole,...
View ArticleState function
I am having difficulty understanding what a state function is. Yes, I know its a function of the state of the parameter, but what are the consequences of state functions? Just beginning thermodynamics...
View ArticleLinear vs. Angular Momentum
In classical mechanics, p = mv L = Iω These correspond to linear and angular momentum, respectively. They're both called momentum, but...they don't have the same units. Why is that?? How can we call...
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Calculations for move in a volume in gas
I would like to calculate the energy need for move in the black volume in gas (move in from r2 to r1), when gas is under rotating movement. The black volume turn at the same speed than gas. The weight...
View Articleconserved quantities in mechanics
So having been through translation and rotation I can conclude that my book has found 3 conserved quantities in classical dynamics: Energy Angular momentum Momentum That is 7 separate quantities which...
View ArticleMagnetic field of magnet and its defination
When we consider a magnet, usually we perceive the field lines to come out of the north pole. But since the poles of a magnet is actually just a man-defined thing, so actually the magnetic field...
View Articlemagnetic kinetic energy thin magnetic layer
Hello, I'm trying to calculate the resonance-frequencies of my multilayer samples by solving the lagrangian. For this I need the magnetic equivalent of the kinetic energy of my samples. Is this...
View ArticleCalculation of work (P.dV) in an isothermal system
Here's the textbook way of calculating the work done by an ideal gas in an isothermal case. PV=nRT P.dV=(nRT/V).dV ∴ ∫P.dV=nRT∫dV/V → W2-W1=nRT*ln(V2/V1) My question. Consider a cylindrical (or of any...
View ArticleWaves in a conductor
I don't really understand how electromagnetic waves in wires are created. Sure you can see from the Maxwell equations that the fields satisfy the wave equation. But if you plug some cables onto a...
View ArticleThe force required to accelerate a radiating charge
If we try to treat a non-relativistic point charge, what force do we need to accelerate it uniformly, when we take the fact that it radiates into account? I assumed the force would do the necessary...
View ArticleBest RLC circuit for Low Frequency underdamped resonance
Hi all, I am tring to design an RLC circuit with a low (<3Khz) resonance out of RLC circuit elements. The circuit must be underdamped. The lower the damping the better. Originally I planned (and...
View Articlethe meaning of vector/cross product
what is the literal meaning of vector product? how could two vectors perpendicular to each other form a new vector which is totally out of their plane how is that possible? can we prove it...
View Articlehow does a fan keep a computer cool
A little while ago I asked: why does wind feel cold. The molecules are moving faster so it should feel hot. The answer I got was that it increases the evaporation rate of water from your skin. Less...
View Articlewhat is a flame? why does sulfur burn?
When we strike a match which is made of sulfur against a hard surface (I don't know what the surface is made of) a flame is produced. That flame can then cause a piece of wood to burn. We can also see...
View ArticleConfused about definition of wavelength!
Wavelength of a sinusoidal wave is defined as the spatial period of the wave, which can be measured between any two points on the wave where the shape repeats. But if my wave is defined as a function...
View ArticleTemperature analog of free energy
The Gibbs energy is used to determine the spontaneity of a thermodynamic process under isobaric conditions. The Helmholtz energy is used to determine the spontaneity of a thermodynamic process under...
View ArticleQuestion about finding a component of the electric field
Let's say I have the electric potential as a function of x, y, and z: V(x,y,z) Now I want to find the x component of the electric field along the x-axis: Ex(x,0,0) I could take the derivative of the...
View ArticleKinetic Energy and Electric Car Power
If we consider the kinetic energy of say a car like Nissan Leaf moving at its top speed we have : K.E. = 0.5 x M x V2 Given that M = 1521 kg, V (top speed) = 150 km/h ≈ 42 m/s K.E. (@ top speed) =...
View ArticleConvection Heat transfer between Cylinders
Imagine Two cylinders One inside another with air in between them.There is a cutout made in the Outer cylinder.The surface temperature of inner cylinder is 200 deg c. My question is Will the
View ArticleHeat capaticy of isobaric process with real gas
Hey, during last lecture of thermodynamics we did polytropic processes, and with no discuss teacher said, that isobaric process is in general polytropic. If we had ideal gas, then it is clear, bud what...
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