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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.

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harmonics 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...

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Basic 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...

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Moving 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

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perpetual 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

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Thermodynamics - 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...

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Momentum 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...

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Using 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...

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Understanding 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...

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Question 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...

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Classic 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....

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absorption 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...

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Average 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...

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Physical 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...

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Experiment 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...

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Relationship 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...

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Generating 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...

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Electrons 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...

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What 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...

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Bénard 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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