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Can someone please explain to me what a "dynamical trajectory" means?
I am reviewing the first chapter of my classical mechanics book (Fetter & Walecka), and in the very first section he uses the term "dynamical trajectory". I have seen this derivation many times,...
View ArticleWiens Law confuses me
My physics textbook is talking about blackbodies and has a graph showing Power radiated as a function or wavelength on the y axis and wavelength on the x axis. The slope grows to it's maximum value...
View ArticleAir Plasma
Hi, I'm curious, how would I create an electric field to a noble gas in a sealed vacuum and how much energy is needed to create plasma from air? You see, I'm building something, and theorizing. A...
View ArticleHow do I convert an inertia tensor from body space to world space?
I've been trying to solve the following problem involving Angular Acceleration and the inertial tensor for about 2 weeks now. I know it's bad ask for a question to be solved, but I'm really at a loss...
View Articlecenter of mass vs. center of gravity
Are there any realistic scenarios for which center of mass is not almost exactly equivalent to the c.o.g., i.e. they must be treated separately?
View ArticleVector current and its measurement
An electrocardigram measures the electrical current in the heart by using several "leads". These leads have +ve and -ve ends. http://www.heartaxis.com/ If you take a look at the interactive FLASH about...
View ArticleWhat software can I use to visualize transformations of the plane?
For example, I would like to visualize the transformation u=cot-1(1/α y/x) v=αx2+y2/α
View ArticleLight and Faraday Cage confusion
Hi guys, The other day I found myself asking the question below and couldn't quite manage to re-align my own personal experience with E&M theory. I am sure it will just be a gap in my knowledge...
View Articleinductance change during breakdown - ICP
Hello. When you flip a switch and pass a current through a solenoid, the changing magnetic field creates an electric field in the center. If that medium breaks down (an inductively coupled plasma),...
View ArticleStanding Waves
Please could somebody explain why the fundamental frequency always has the biggest amplitude in comparison to the rest of the harmonics?
View Articlethe range of rocket
hello guys could anybody tell me the method of finding the range of a rocket launched from height h, the rocket of course is under three forces weight,drag and thrust
View ArticleNewbie questions about core mechanics topics
I am a newbie to physics forums and I would like to say thank you to the creators of this site because it is going to be a huge help to me and my future endeavors into physics!!! I honestly do not know...
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Diffraction grating: arbitrary incident angle
Diffraction on 1D grating is covered in many physics books. Usually they cover simple case when incident light is coming along the normal to the grating. Sometimes they present slightly more...
View ArticleWork done by an expanding gas
Today in an engineering thermodynamics lecture, the professor gave an example of a gas doing work. We had a cylinder full of helium at a pressure of something like 200kPa absolute and the valve was...
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Pulleys and spring (?)
Consider the system shown in the picture. What are its degrees of freedom? And is the Lagrangian below,the correct one for this system? [itex] \mathfrak{L}=\frac{1}{2} M_2...
View ArticleEquipartition Theorem Degrees of Freedom
Hello everyone, Today, in class, I learned about the equipartition, and the degrees of freedom a thing can possess. My professor had said that if you were to consider a gas composed of single atoms,...
View Articleviscous stress tensor
hey pf! in reading a book on viscous stresses i found the following: [tex]\tau_{ij}=2\mu\Big(s_{ij}-\frac{1}{3}s_{kk}\delta_{ij}\Big)[/tex] where einstein summation is used. now we have...
View ArticleVeracity of Simple Molecular Model
Hello Everyone, I understand that sometimes in physics we make a model of some physical system purely for theoretical convenience, as it allows us to calculate certain properties of the system very...
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