frictional force equation
Why isn't the force of friction F= (frictional constant)(force of gravity)? Since F = mg(coefficiant) and g is negative denoting the direction of the vector, gravitational force.
View Articleharmonics and soft tissues
Hi, I am currently doing a master where i stimulate the brain with repetitive transcranial magnetic stimulations over the genioglossus muscle motor cortex. The upper airways are often compared to a...
View ArticleBasic Optics
Very basic optics questions: 1. So light is a type of radiation, due to which we see objects. Some objects, like a candle, are luminous and we can see them without another light source. Some other...
View ArticleMoving magnetic dipole!
Does anyone know how to calculate the magnetic field or flux of a uniformly moving magnetic dipole with magnetic dipole moment [itex] \vec{M} [/itex] pointing along the direction of motion? Thanks
View Articleperpetual motion machine !
perpetual motion machine ! i read many of this papers but it violates the first law of thermodynamics . can it come true one day
View ArticleThermodynamics - dependence of molar fraction on temperature
Why does the molar fraction of a solution not depend on temperature? In other words, why will heating a solution preserve its composition? It seems to me that if I have two substances that evaporate at...
View ArticleMomentum delivered to a piston
Okay so please forgive the simple question - I am slowly educating myself but find that sometimes the intuitive view evades me. In Feynmans Chapter 38 of Vol 1 - I am reading through kinetic theory of...
View ArticleUsing a force gauge vs. scale
I'm trying to make a fixture measure how much force it takes to deform various items. However, digital force gauges costs upwards from while simple scales don't cost much at all. What's the difference...
View ArticleUnderstanding Surface Tension
I am studying surface tension and I am summing up what I have learnt through books till now: → On a molecular level, due to unbalanced forces on the uppermost level, the liquid molecules tend to go...
View ArticleQuestion on Boltzman statistics and numbering of states
Consider a monatomic gas of hydrogen (just to make the example as simple as possible) at a temperature T. If I use Boltzmann statistics, I would say that the probability of finding any arbitrary atom...
View ArticleClassic Pressure Decay
I am trying to understand an equation that I found in an old document concerning pressure decay of a sealed assembly. The assembly is pressurized and over time decays to 1 atmosphere ambient pressure....
View Articleabsorption of radiation from a 'cooler' source
This post specifically queries the absorption, by matter, of (thermal) radiation which has been emitted from a source of a cooler temperature than the receiving matter. As I understand it, when matter...
View ArticleAverage acceleration formula
The formula for average acceleration is (v_final - v_initial) / (t_initial - t_final), I was wondering if v_initial and _final are the instantaneous velocities (found by second derivative of a...
View ArticlePhysical pendulum in phase space
Hi, I found out this paper http://www.pha.jhu.edu/~javalab/pend...t/pendulum.pdf with this animation http://www.pha.jhu.edu/~javalab/pend...t/pendula.html At first there is written there, that the area...
View ArticleExperiment about emf.
The attached drawing represents 4 wires. The top and down are still. The right and left move with the same velocity v as shown by the arrows. There is a magnetic field perpendicular to the page. Will...
View ArticleRelationship Between Kinetic Energy and Temperature
Hello everyone, I am currently reading the pages from a book called Thermal Physics, which was written by Daniel Schroeder; the pages to which I refer are 10-13. In these pages, he derives the...
View ArticleGenerating a magnetic field
I'm trying to generate a magnetic field that's strong enough to be detectable (i.e., still stronger from the earth's field) at some distance away from where I'm generating it. I have a pretty simple...
View ArticleElectrons losing heat
Do electrons lose heat? If they do, how do they do it? Bremstrahlung for free electrons and going down to a lower energy level for bound electrons? If you had say a metal and cooled it down, would the...
View ArticleWhat is translational entropy?
Hello, I am trying to understand a short literature article (doi: 10.1021/ja01635a030). I am not sure how much liberty I have to reproduce its contents here, and I can't explain it here because I don't...
View ArticleBénard cells
I'm hoping to make (or model) these little cells on my own, but I'm not entirely sure how it can be done with household materials. I've seen a few videos of it being done but there's not much on how to...
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