Precious-Opal and/vs X-Ray Diffraction
(My (old) background is math & computer science. I've long loved (mostly) precious opals - for thier esthetics, lapidary potential, synthesis (which I've done), and how the play-of-color ("PoC") is...
View ArticleDiffraction Limit Sample for Microscope
Hi all, So, I'm trying to "hit" the diffraction limit (i.e. view Rayleigh criterion, or Abbe or Sparrow criterion) with my light microscope . Bought the scope off amazon..it's a typical AmScope that...
View ArticlePhase transistions and Partition functions
I'm studying phase transitions in statistical mechanics, and I'm curious to know more about how the partition function becomes zero. I've read a bit about the Lee Yang theorem, but haven't found a good...
View ArticleHuang 7.6-7.8
I am specifically referring to textbook "Statistical Mechanics" by Kerson Huang. It is not a general physics question, I am just trying to understand what is written in this specific book. So you can...
View ArticleCarnot cycle
Hallo, I read about thr Carnot-Cycle and got a problem. A->B: isothermal B->C: adiabatic C->D: isothermal D->A: adiabatic I want to understand how to calculate the work done in the...
View Articleseems to be a "paradox" in galilean relativity
Hello I'm having a little bit of trouble with so-called rest frames. I will distinguish two cases. consider frame S, and a particle moving along the x axis at speed v. Case I: consider the rest frame...
View ArticleBeam Calculation
I have a 120mmx55mm c-shape beam form using a 4.5mm thick mild steel plate UTS=400MPa, on the flange it has an rectangular cut of 110mmx43mm, if this beam is subjected to a tensile force of 1150kg,...
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Null point accuracy measurement
Please refer the attachment, i had tried this question as in attachment "answer 1 and 2" getting the same answer as in the question. However, now i realized in the answer given after differentiate...
View ArticleCapacitors : concepts
I have several questions about capacitor's concepts. Q1)What does battery really do in charging a capacitor? Q2)Uncharged capacitor doesn't mean the plates don't have any charges? Q3)During...
View ArticleForce in spring due to falling object
Hi, I'm designing a crane that is supposed to withstand forces due to a falling object attached to the crane with a non-elastic cable. I have some troubles to calculate what force that will be due to...
View ArticleGauss's Law at an interface
Consider the interface between two materials with different electrical permitivities ε1 and ε2; Let's say we know the surface charge density on this surface γ(Let's say the only charge is on the...
View ArticleInteraction tetween two waves soliton
Hello if i have two waves soliton [tex]y=A \sech^2 (k(x \pm ct))[/tex], both solution of KdV differential equation how i find a equation for the interaction between the right and left waves [tex] \pm c...
View ArticlePotential of a conductor in a non-uniform E field
imagine there is a positive pt charge somewhere in space. so the E field due to this pt charge, falls off with distance. now, i place a conducting rod parallel to the field some distance away, such...
View ArticlePhysics and Baseball, relating the two
Hey everyone. I've asked a few questions before here, but now I have one not related to my homework or career possibilities. It may be a little difficult. I am a baseball player and I know classical...
View ArticleTemperature of some things today via IR thermometer.
The sun, ≈ 150F (sensor has 9.5 degree viewing angle, sees 1m @ 6m) Blue sky, -36F Cloud in the sky, 16 plastic in the shade, 56.8 (Thermometer in shade reads 57) Inside freezer, -8.6 (oops, looks like...
View ArticleHow do you calculate resultant velocity?
Say I have a boat moving at 10 m/s south (160 degrees) ina river that is flowing at 3 m/s east (90 degrees) How would you calculate the resultant velocity in this instance?
View ArticleBuilding a Cyclotron
Hello everyone, I'm very interested in building a cyclotron as a learning experience over the next year or so and have been doing some reading on what's required. I figure it would be helpful to ask...
View Articleearth stereographic projection line intersection
Hi, Consider you are standing upright and pointing your finger at the ground. Where does the vector coming off the tip of your finger arrive when it hits ground level on the other side of the Earth?...
View Articlefictitious forces in rotating frames of reference
I got stuck going over the derivation of fictitious forces in rotating frames. see specifically http://en.wikipedia.org/wiki/Rotatin...the_two_frames this page to see the proof i'm talking about (sorry...
View ArticleForce of Gravity On Earth
So I was thinking about the equation for the acceleration of gravity on earth, or g: m*g=G*M(earth)*m/d^2 I guess it's universally accepted that different masses on earth's gravitational acceleration...
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