Spreading of a pulse as it propagates in a dispersive medium
Hello everyone!! Im studying the spreading of a pulse as it propagates in a dispersive medium, from a well known book. My problem arise when i have to solve an expression. Firstly i begin considering...
View ArticleEyepiece for refractor telescope
Hi, Iam thinking of making my own telescope and I have a magnifying glass lens, biconvex, about 10 cm in diameter and 27 cm focal length. I think it would be better as the objective. For the eyepiece,...
View ArticleAccelerated charges
My days in high school are almost at an end and I don't want to run to my teachers with this question. So can someone please explain this to me: why an accelerated charge emits photons and loses...
View ArticleHow does movement of an electric charge create a magnetic field?
I've been researching this for hours and yet cant seem to get an understanding. So, let's take an electron fixed in space. At any given time it has an electrostatic field around it which decreases with...
View ArticleWho was the creator of principle of inertia
Hi all, It is really a history question. I read that Galileu developed the concept of inertia, but today I knew it from Newton's 1st law. So my question is: Both of them arrived at the idea...
View ArticleMeasurement of the re-condensation of steam within a vascular model
I am attempting to determine a way to measure the re-condensation rate of steam as it is introduced into a blood vessel. Trying to come up with a good bench top model for initial studies. Any...
View ArticleTransverse Wave equation for a string of changing length?
I'm trying to learn more about the physics of guitars. I followed through the derivation of the transverse wave equation and that makes sense, but it seems like several of the simplifying assumptions...
View ArticleKinetic energy of Freely Jointed Chain
Dear all, Imagine you have a Freely Jointed Chain in 3D (http://en.wikipedia.org/wiki/Ideal_chain), segments of same length which are consecutively connected with free joints. I need to calculate the...
View ArticleMaximum Charge on Designed Capacitor
I'll spare you all the details, but suppose for some reason (too complicated to get into here) I needed to design a capacitor with certain fixed parameters and only one adjustable aspect, and I wanted...
View ArticleThe specific heat capacity of solids
Why is the specific heat capacity of most solids around 25JK-1mol-1? I remember being told ages ago that is was something to do with the theory of equipartition but i'm not really sure how that theory...
View ArticleMotion along a Slanting Line
All, I have to teach One Dimensional, Two Dimensional, and Three Dimensional Motions to my son and have been reading quite a bit on these topics. I still have a question and would be glad if someone...
View ArticleWhy an electromagnet doesn't makes a short circuit?
How can you have a simple coil connected to a battery without having a short circuit in it? How do they make electromagnets that don't heat the battery? Thanks :)
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Contact angle of liquid drop on solid surface.2
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 ArticleHow Can We See the Blue Light of Day *Only*?
Imagine a very big, opaque planar disk blocking the sun's direct rays which is placed horizontally at a high elevation. Is it possible that such disk, by blocking the sun's direct rays but allowing the...
View ArticleHarmonic Oscillator Model
So I am trying to model a harmonic oscillator floating on the oceans surface. I treated this as a harmonic oscillator within a harmonic oscillator and I am not sure if I am heading in the correct...
View ArticleClassical spin system. Ising model.
Energy function ##E=-S_1S_2##. I took ##J=1##. If spin are oriented paralel energy is negative. How could energy be negative?
View ArticleUniversal motor and the second law of thermodynamics
Hi, I noticed that universal electric motors have peculiar electrical <=> mechanical transfer function, which seems to break the second law of thermodynamics. Can anyone show where did I do the...
View ArticleConcept of 'work done' on a smooth slope (high school-level physics)
Say you have an object on a smooth friction-less slope, and a force 10N (acting parallel to the slope) is applied to it to move it at a distance 5m up the slope. Work done by the force is:...
View ArticleCircuit with 2 Batteries and 6 Resistors
1. The problem statement, all variables and given/known data A circuit is constructed with six resistors and two batteries as shown. The battery voltages are V1 = 18 V and V2 = 12 V. The positive...
View ArticleEnergy stored in charged ring current
I'm a little disappointed in myself for not being able to calculate this or find the answer online, but I've hit a bit of a mental block so I was hoping someone could help me out a bit. I was doing a...
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