Heat transfer in deep space
So, I know that it has been sort of asked in other forms before, but they mostly deal with human beings and so I've yet to find an answer to the specific part of this quandary: if a mechanical system...
View ArticleMotor and required torque.
So I need a motor that is able to provide [itex]\begin{equation}0.412Nm\end{equation}[/itex] of continuous torque (to overcome rolling resistance). A BLDC I have is rated at...
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Scaling an Axial Compressor
Let's say I have a precisely designed axial compressor, comprising of stages of rotor and stator wheels, that resembles something like this: Such a compressor, driven by a certain torque at a certain...
View ArticleHeat transfer with internal heat generation
In a heat transfer with internal heat generation what does the term "internal heat generation" mean? Is that applicable only if a body itself produces some heat (Like current carrying wires,nuclear...
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damped oscillator- graphical interpretation
Hi! The damped oscillator equation is as follows: x(t)= A exp(γt/2) cos(ωt) where ω= √( (w0)^2 + (γ^2)/4 ) I have attached a graph of a damped oscillator. The question is if I use graph to measure...
View ArticleThe temperature change in a throttling process
Hi, I'm writing a small student-paper on heat pumps, and I'm not at the point where i explain the physics behind it. This is probably a silly question, but there's something I can't seem to understand...
View ArticleNormalization to delta distribution
Do you know some example of an operator, other than momentum or position, that has (at least partially) continuous spectrum with eigenvalues [itex]s[/itex], and the corresponding eigenfunctions obey...
View ArticleHow to define forced non-centroidal rotation and conservation of angular...
Hello all. I'm a newer engineer in rotor dynamics trying to better understand some things, so perhaps someone can provide some insight... First, I'm trying to better understand the physics of forced,...
View Articleheat equation in real life
The heat equation predicts that heat spreads infinitely far over arbitrarily small time intervals. What happens in real life? How does the heat equation get modified?
View ArticleConverting Directly into electrical energy
Is there any known method to convert straight into electrical energy? without all that 'steam' part? xD
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answer confirmation-not an assignment question.
Hi! I have attached the picture. Can someone please tell me what equation of motion will be? My guess is that it will be [itex]\ddot{x}[/itex] = -k/x -kx/2 Attached Images spring.png (7.9 KB)
View ArticleElectric Field In Medium Clarification
So I just wanted to clarify: Because D = ε0E + P P being zero in vacuum and ∇D is constant regardless of medium if D was originally in a vacuum, the corresponding E would be greater than if it were in...
View ArticleWave guide modes: what are they, how are they used
I posted this in the EE forum but I think the physics forum may be more helpful. Title pretty much says it all. In EM waveguides (rectangular, circular, what have you), I understand there are various...
View Articlemagnetic or electric field?
Hello, if I put two plates one in front of the other and apply a voltage I read that an electric field creates, but shouldn't also exist a magnetic field since there are moving charges ? thanks
View Articlewhy does a system expand when doing work?
Is it because for there to be work there must be heat entering the system, which is what is really causing the expansion of the system? Or is it something else? Also vice versa, why does a system...
View ArticleTwo atoms and speed of sound ?
How fast is speed of signal between 2 atoms ? Is it speed of light in electric field and then it slows down to speed of sound at more massive nucleus (p=mv) ?
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Thermodynamics cycle with liquid and gas
I'm trying to find why this thermodynamics cycle is not possible but I don't find. The only problem for me is at step 3, the gas can't become a liquid but why ? Attached Images g1g2b.png (34.1 KB)
View ArticleElectric polarization of a dielectric due to a magentic field
Imagine a dielectric cylinder placed in a uniform magnetic field parallel to its axis. Then we make it rotate around its axis. The nuclei and electrons should feel a radial lorentz force because of...
View ArticleEffect of material size on magnetization
I'm a bit confused about the effect of the size of ferromagnetic material on the magnetic field it generates so I was hoping someone could explain it to me. The saturation magnetization is given by M =...
View Articlephase portrait for a conservative negative potential
Hi, i was studying Classical Mechanics course introduced by the brilliant Prof. V. Balakrishnan http://www.youtube.com/watch?v=8X1x9RLaaxc he was studying the phase portrait of a simple harmonic...
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