Make solid ice from supercooled water?
Im having a discusion reguarding what temperature (celsius) supercooled water needs to be if it was to freeze completely solid. Going from liquid to solid "produces" heat. Therefor it is obvious that...
View ArticleWork done by compressing a container of gas
I want to show that the work done by compressing a container of gas with uniform pressure is [tex]-\int_{V_i}^{V_F} p(V)dV,[/tex] where p(V) is the pressure of the gas as a function of volume. This...
View ArticleIs There A Relationship Between Young's Modulus And Spring Constant?
We know that the Young's modulus of an object is defined as the ratio between its stress and strain: Y = σ/ε , or: Y = F*L/A*ΔL We also know that Hooke's law, which can be applied to any linear elastic...
View ArticlePrecession in B field
There is a problem about precession in general that I am trying to understand, and it can be exampled by electron orbiting around nucleus in external [itex]\vec{B}[/itex] field. We could consider...
View ArticleContact angle of liquid drop on solid surface.
Can anyone explain point 44 of the attached pdf document on surface tension. (Here's the link in case attachment doesn't work: http://www.sakshieducation.com/EAMCE...0_198-208_.pdf) How is the surface...
View ArticleFinding mass of spring from time period.
As the title suggests, there is a practical in which we have to find mass of the spring (m*) having a block of mass M attached to bottom, from GRAPH of time period (T)^2 against M. Here's what the...
View ArticleDevelopment of Bernoulli's equation
My book says: [itex]\frac{\partial V}{\partial s}\frac{ds}{dt}=-\frac{1}{\rho}\frac{dP}{ds}-g\frac{dz}{ds}[/itex] (1.28) The changes of pressure as a function of time cannot accelerate a fluid...
View ArticleDifference between Generalised co-ordinates and degrees of freedom
What is the difference between Generalised co-ordinates and Degrees of freedom in classical mechanics? I know that they are not equal when we have non-holonomic equations of constraints. But I don't...
View ArticleTwo questions about thermal radiation heat transfer
Hi guys, could you concretely explain me (also with a simple example) the difference between blackbody emissive power (sometimes found as e'λb) and blackbody radiation intensity...
View ArticleSimple Harmonic Motion: Period depends on k coefficient of spring and mass...
Period does not depend on amplitude. Correct? I deduced this from the equations for simple harmonic motion: ω=2πf ω=√(k/m)
View ArticleIs fortran 90 or matlab better for simulating non-linear dynamics (Chaos)?
I am going to be simulating damped driven oscillators for my project and I was wondering if someone could give me a definitive answer on the matter. I know matlab is more of a 'tool' than a language so...
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Electric Potential Energy and Work
Hello. I need help clearing up who's gaining potential energy and who's losing potential energy from an particular object perspective. And, from that object perspective, whether the object doing...
View ArticleHow hot is the sky?
An object (a tin can for example) orbiting the Sun at about the same distance as the Earth would be what temperature?
View ArticleLouiville's Theorem, a question
So I noticed that when learning about Liouville's Theorem in class, that it was described in terms of ensemble: i.e; you have a 6N dimensional phase space for N particles moving in 3 dimensions and...
View ArticleThe vector nature of Angular Momentum
Here is an animation from Wikipedia : http://en.wikipedia.org/wiki/File:Torque_animation.gif The angular momentum is given by the Cross product of r and p We can see that the direction would be...
View ArticleMany wave - beat frequencies.
I'm modelling a system that (at the most simple level) is a sum of superimposed waves with different amplitudes. I'll spare all the details but I'd like a nice "rule of thumb" for a beat pattern of...
View ArticleWhat exactly is centrifugal force
I think that there is no such thing as centrifugal force . Am I right ? is this force fictitious ?
View ArticleThermodynamics: Entropy of the Maxwell-Boltzman distribution?
I know that the entropy of Bose-Einstein and Fermi-Dirac statistics as a function of the mean number of particles per state r (nr) is: S=-k*Sum_over_r(nr*ln(nr)+-(1-+nr)*ln(1-+nr)) where the upper sign...
View Articlebasic fluid dynamics
Hi guys and girls, I hope you can help an electronics engineer out of his place in the mechanical world:uhh: My very basic question is for a vessel holding a liquid at a given pressure and a given...
View Articleconflict in AC electricity
helllo ALLLLLL my question in Ac single phase without earth only one phase live and one neutral why we say that live line would kill but neutral won't kill isn't neutral carry current for return "same...
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