Vapor Pressure and Atmospheric Pressure
From what I have read so far, the vapor pressure of a liquid is temperature dependent while it is independent of the atmospheric pressure. I am not sure why atmospheric pressure would have no effect of...
View ArticleHarmonic plane wave
Hi, why does the harmonic plane wave have the form below: [tex]V(r,t)= acos[\omega (t-\frac{r\cdot s}{v})+\delta ][/tex] (r is the position vector, s is the vector that points to the direction the wave...
View ArticlePoynting vector
In case of a circularly polarized wave, is the poynting vector also circularly polarized? If not what happens in this case?
View ArticleBalancing a 3d weight vs lift system
Hi I'm trying to balance any 3d system with various fixed weights by selecting the correct lift forces for points of lift an example system would be the following shape ( view from above , think a...
View ArticleLegendre Polynomial and Rodrigues' Formula
I am reading Jackson's electrodynamics book. When I went through the Legendre polynomial, I have a question. In the book, it stated that from the Rodrigues' formula we have Consider only the odd terms...
View ArticleWave transmission
When a plane wave for example is travelling from air-->dielectric and we know the power flow of the incident and transmitted wave (i.e 200mW/m^2 and 150mW/m^2) with no info about the dielectric...
View ArticleHow to imagine a classical phase space for N particles?
Classically a single particle will have 3 position coordinates and 3 momentum coordinates, and so it "exists" in a 6-dimensional phase space and moves around this space in relation to time (known as...
View ArticleTorque due to reaction force at contact point of two objects
Hi there, I would like to know that if we have an leaning object supported by another object, both are supported by ground floor to satisfy static equilibrium condition, does the reaction force at the...
View ArticleSome useful form of the eq. of state of a REAL gas?
It is written that: Another useful form of the equation of state of a real gas is: Pv= A + B/v + C/v[itex]^{2}[/itex] + ... Where A, B, C, .. are functions of temperature and are called the "VIRIAL...
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Can fundamental laws of physics be derived? (Mass from Electricity)
Below is a derivation of Newtons second law of motion, F=ma, from classical electrodynamics! F=ma is a fundamental physical law (it is the same as conservation of momentum). One should not be able to...
View ArticleWhat does this boundary condition mean?
One of the boundary conditions for a homogeneous uniform waveguide is [tex]\frac{\partial H_z}{\partial n}=0[/tex]. What does this mean physically?
View ArticleFriction and normal force on an incline
I have an incline A that is very steep reaching a vertical height of h and another one B which is less steep with the same vertical height. So using the work energy theorem: in A, KE+work done against...
View ArticleIs it possible to power a freight train with an animal motor?
The question is whether freight could be hauled along train tracks using only beasts of burden as a power source. My first ideas of a design involved tying, say, horses, to a belt which would drive a...
View ArticleWeird!? About the direction of rotation of wheels
Suppose we consider a car moving on rough road in forward direction, wheels rotating clockwise. Since wheels rotate clockwisely they will push road backwards so friction acts forwards i.e. in direction...
View ArticleSpacecraft re-entry
I recently read about the communication blackout during a spacecraft re-entry.. The reason given was the high density plasma formed whose plasma frequency is such that the communication waves do not...
View ArticleTrying to fix a simplification issue for a general range formula
So I have derived a formula for the range of projectile in a vacuum fired from an arbitrary height h from above the ground as the following... R=(vcosθ/g)[vsinθ+sqrt((vsinθ)^2+2gh)] Now it seems all...
View ArticleSolenoid within a solenoid
I was looking at Griffiths intro to electrodynamics problem 6.12 and Im confused by the solution given in the solution manual. If you have this book or not Ill explain the problem anyway. We have an...
View ArticleWhy does a heavier sledder go faster?
In my experience, a heavier sled rider always goes faster than a lighter one (given the same sled design). When looking at this in terms of energy, it doesn't make sense. If we disregard air resistance...
View ArticleBead on a Rotating Hoop - Constraints (Holonomic / Nonholonomic)
1. The problem statement, all variables and given/known data We have a bead sliding with friction on a hoop oriented vertically. First the hoop rotates about its center with rotation axis perpendicular...
View ArticleNewton's Third Law Explanation
For every force exerted by object A on object B, an equal and opposing force is exerted by object B on object A. I need help understanding the principle. I understand it when dealing with a completely...
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