Kepler Problem
How do you solve the Kepler Problem for a 2-body system where m1<<m2 with a given velocity and position vector resulting in a new velocity and position for a certain time interval?
View ArticleChemical potential and fixed number of particles
Can we talk about the chemical potential of a system with fixed number of particles? Is this physically meaningful? Why/why not? P.s: I know that chemical potential is the partial derivative of free...
View ArticleFiber Optic Faceplates
I am trying to find out more about these devices. In particular, how to model them. In other words, can one use a convolution technique to model how an image on one side is transfered to the other...
View ArticleHigh Fidelity 2 Axis Gyro
I want to model a free 2 axis free gyro. I used to have a very detailed model, but cannot find it. It was cross coupled, and included many disturbance torques. All I am looking for is a great source on...
View Articleatmospheric railway versus conventional railway
There is a new automated people mover (APM) opening in Porto Alegre, Brazil called Aeromovel; it is built using atmospheric railway principles (see...
View ArticleFunctions of time 0?
Hi Guys, In a lot of books dealing with spectroscopy, correlation functions or any kind of functions involving time sometimes take the form like this: [itex]\left\langle A[q,u(t)]A^{*}[q,u(o)]...
View Article"Paused" physical system
Greetings, physicists and others, who just happen to understand physics. Something is bothering my mind again and I am hoping that some clarity will be given here. So, here is what I am thinking: if I...
View ArticleFinding north with copper wire
How do you figure out which way is north when you're lost and the only things you've got with you is a copper wire and a voltmeter? Thanks in advance.
View Articlehalf-silvered rear surface phase shift
I have read that the rear surface reflection of a half-silvered mirror undergoes no phase shift. But they caution that this is true only for a dielectric mirror. What is the answer for a metallized...
View ArticleFiguring out the forces
Hi, Please take a look at this figure: Screenshot by Lightshot There is a force that is applied so that block B will not fall under the influence of gravity. I have set up the problem as: F= (ma+mb)a...
View ArticleWhy do air foils produce lift?
Hello, I have recently joined with hope that I can find a straight forward answer to a question that has bugged me for so long. Why do air foils REALLY produce lift? I have heard and read of the most...
View ArticleCan Rotational Dynamics be derived from Translational Dynamics?
Torque, in particular, is always a concept that has confused me. Can the rules related to torque be derived or are they natural tendencies? (For lack of a better way to phrase this). For example, if I...
View ArticleHow does the light from a laser reflect off objects with same color?
Hey guys, I'm wondering how come if we're in a completely dark room and shine a laser beam at an object, we see the color of the laser beam (say it's red). How is this consistent with the the theory...
View ArticleNeed help in solving thermo problem
Hi The thermo problem is as follow: I have a fireplace and I have an underfloor water pipe heating. currently the underfloor water is heated by gas burner. I want that the water will also be heated by...
View ArticleAlternating Current and Simple Harmonic Motion
Hello, I was being taught AC in High School, It was good but the way they taught us DC, things like drift velocity, no of electrons per unit volume etc, it was easy to visualize electrons rushing in a...
View ArticleForce of attraction between two bar magnets
Hi, I have carried out an experiment to investigate the force of attraction between two bar magnets by changing the seperation between the two magnets. Both bar magnets are about 4cm long and I have...
View ArticleThermodynamics - Internal energy of state
I had a question : Heat energy was supplied to melt ice at -15 degree Celsius. But it was not enough to turn the ice completely into water at 0 degrees. From my calculation I obtained that a mixture of...
View ArticleReference frame in relative motion
I red a classical mechanics concept in a book. Imagine that we have two observers with two frames of reference F1 and F2 observing a particle P in motion. One of the observer is in motion and another...
View Articleclarification in the definition of particle
A red a book in classical mechanics , the author says A particle is an idealised body that occupies only a single point of space and has no internal structure clarify me these terms Idealised body and...
View ArticleThermodynamics - thermal energy?
The thermal energy comes from the translational kinetic energy right? The relationship between the two being E(kin)=1.5kT how would i go about finding the total thermal energy of a system of a given...
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