# Search results

1. ### Definition of an Asymptote

Hello, i'm having some trouble understanding the definition of an asymptote, or rather the conditions that must be met in order for a line to be one. I have; "Let f : A \longrightarrow B be a function and A \subset R, B \subset R. A straight line is called an asymptote if one of the following...
2. ### Trig identity help

Hello there, I have a problem i'm hoping someone can help me with. I'm writing a bit of code for computing the value of pi that converges faster than a previous piece that relies on the leibniz series. Anyway, i'm struggling with showing how this identity arises. tan(2t) = 2 * tan(t) / 1 -...
3. ### Photons, no mass and momentum

Hello, I have a question that i'd like to ask, but the wording is a little tricky, so I hope you can get the gist of what i'm trying to describe. I was thinking about the thought experiment that is often used to describe relative motion - a light clock on a train passing through a station...
4. ### Maths requirements for aerospace engineering

Hello, right now I am a first year architecture student in the UK, but i'm really not enjoying my course as much as i'd thought I would. I think I surprised my family when I chose this path, as they all assumed I would do something either in science or engineering. Anyway, I am considering...
5. ### The length of an uncoiled spring

Hi there, my question is how would I find the length of an uncoiled spring? I hope that is clear enough, but other ways of explaining what i'm looking for look like this: How would I find the length of a line that made a spring x meters high? Or how would you know how long a piece of...
6. ### Logic behind the number of combinations of numbers

Hey, so i think this is a fairly simple question but i'd like to get it firmly understood in my head. How do you figure out the amount of combinations of digits in say a 4 digit code. with numbers 0-9... I can't think of a good way to say it, but for example you could have 0,1,2,3 or...
7. ### Model of the universe/quantum computing

Hello, first off, i'm not sure if i have placed this question under the correct forum, so i apologise for that. Secondly, i don't really know what quantum computing is, i'm basically guessing... To give you an idea of what my understanding of certain ideas might be, I start my...
8. ### Packing within a neutron star

Hey, So i just read 2 articles, the first talked about the mathematical problem of 'packing', IE how many smaller objects of the same size can fit inside a shape without overlapping or covering the boundaries of the shape. and the second article was talking about a recent neutron star that...
9. ### Thermal Equilibrium - in a microwave?

hi, i don't quite know how to pose this question but i'll try my best. if you have an object and heat one end of it, energy will move from an area of high energy, to an area of low energy. By this method, heat transfer will stop when all regions of the object are at the same temperature...
10. ### Universal gravitational constant

hey, so in Newtons equations for gravitational force etc, the constant 'G' is used. where does that come from? how do we know it's value? how was it discovered? thanks, Lntz
11. ### Schroedinger's energy levels - potential wells

maybe this question has more to do with chemistry, but it's physical chemistry at the very least. so, in physics class we have been learning about schroedingers equations for the H atom electron energy levels, and discussing bound electrons in a potential well. for these electrons to move up...
12. ### Collapse of the wave equation

i am an A-level physics student (high school if you're american) and for a research topic i have chosen wave particle duality. i have been able to explain the ideas of diffraction, double slit experiments, photo electric effects and electron diffraction easily enough, but we are expected to take...
13. ### Kinetic energy of a rotating disc

if KE=1/2mv^2 and you have a circular object rotating, with it's mass uniformly distributed through the object (ie each part of the disc weighs the same) then obviously certain parts of the disc will be moving faster than others. therefore closer to the middle of the disc, you have more KE...
14. ### Why do photons not pass straight through objects?

so i often hear the analogy of an atom being on the same scale as a foot ball in the center of a pitch, with the electrons all in their orbitals at some large distance away. in chemistry we have been discussing the difference in energy levels of electrons and using these to describe the...
15. ### What is the actual 'mechanism' of friction

in mechanics and physics we are forever talking about friction and using it to solve problems. but what actually is friction? is it as simple as saying how rough a surface is? that doesn't sound adequate to me. if that were the case then i'd expect all materials to have the same...
16. ### Flux Linkage - what, where, why?

Hi, we have been doing lots of work recently on magnets. we have learnt about the ideas of flux, and using them to describe induction and how transformers work etc. i feel that i understand quite well about these ideas, but now i have come across this idea of 'flux linkage'. i do not...
17. ### Wave -Particle dualtiy, the most convincing evidence?

hello, i am writing a report on wave particle duality and i have included the experiments you would expect. young's inteference patterns as evidence for light as a wave, and the photo electric effect providing evidence for light as a particle. etc. what i am concerned about is does the...
18. ### Speed of light - permeability?

so what i am about to write is quite possibly wrong, but this is just how i was thinking about why the speed of light is different in a vacuum as it is in glass or water etc. i am writing this to see whether my train of thought is on the right lines, and if it isn't to hopefully get an insight...
19. ### Virtual particles in interactions

Hi, so we have just started doing some physics of fundamental particles etc at school. i am reading alot about the exchange of 'virtual' photons etc. i am confused about whether these particles actually exist in a physical sense or whether they just have to be there to conserve quantities...
20. ### Scattering - quantum electrodynamics

hi, so i have just finished reading my first ever book on quantum electro-dynamics (the feynmann lectures). i am in year 13 of school, or High school some might call it. he draws a diagram in the book (a space time diagram) to represent an electron absorbing a photon and then re-emitting...
21. ### Wave-particle duality and special relativity

hi, i am in year 13 of school, so i would appreciate it if any responses to this question weren't too far over my head. saying that i have a fairly decent back ground knowledge of some of these ideas. so, we have learnt about the whole lead up to deciding photons etc. are not waves or...