# Recent content by Arcthor

1. ### What factors influence voltage

Thank you for your answer! I really like the analogy, however, I find it hard to do the math if I do not understand why it happens. Wow your answer to question 2 was really eye-opening, you cleared up a lot of confusion. Thank you! Thank you for a great answer, really appreciated. I don't...
2. ### What factors influence voltage

I have some trouble grasping voltage, and why it is defined by V = R * I. 1. If voltage can be seen as some form of electrical potential energy, why does it not increase as the circuit is made longer (in terms of meters). Would a current be as likely to travel in a 0.1 meter circuit as in a...
3. ### How should I proceed in my study of physics / mathematics?

Multivariable calculus is one of the first courses I am going to learn, so I don't know.
4. ### How should I proceed in my study of physics / mathematics?

Yeah, I am nowhere near learning quantum mechanics :) Just wanted to know how to get there. I don't really know how Sweden's education system compares to USA etc, but i've definitely learned basic calculus (derivation, integration, different integration techniques etc and how they relate to...
5. ### How should I proceed in my study of physics / mathematics?

I recently graduated from High School (or Sweden's equivalent). I am entering quite a difficult university program studying physics / math in a couple of months. I am interested in self-studying this summer simply because I find the subjects fascinating, especially the mathematical side of it...
6. ### Standing waves in tube closed tube

http://i.imgur.com/aDSGYG0.jpg What am I missing?
7. ### Standing waves in tube closed tube

Sorry, the water makes up the closed part. The opening is open.
8. ### Standing waves in tube closed tube

Homework Statement A tone with frequency 2,00 * 10^3 Hz is held above a tube filled with water. The water level is increased and decreased. When the water level is 5.7cm below the opening of the tube, the first sound maxima is heard. When the water level is 39.3cm below the opening of the...
9. ### N-body simulation

It is negative. It currently looks like this. E_m = (mv^2 / 2) - (GMm / r)
10. ### N-body simulation

Okay, the project is due in two days, but I'll try to implement a leapfrog integrator. Hopefully it's not too hard. But if my orbits are getting further and further away from the sun, shouldn't that be because of an excess energy in the bodies, not less?
11. ### N-body simulation

Okay, just to be clear. The mechanical energy of earth (kinetic and the potential energy to all other planets) is actually decreasing as time passes. It starts off being around 2*10^33 Joules and after about 20 seconds, it is 1*10^33 Joules. Is this problem big enough to cause the errors I am...

Thank you!
13. ### N-body simulation

Oh okay, finally I know why atleast. Do you know any easy method to fix it? Or which method should I use instead? Is it the energy that needs to be conserved? Keep in mind that I am only in high school and haven't got a great amount of programming experience
14. ### N-body simulation

Thank you for a very informative reply. Ooh sorry, I think I didn't look close enough. They don't exactly look elliptical, but certainly not circular either. I am not defining how they should move :) Gravity does all the work. Here is a video of how they look, sorry for the quality . Notice how...
15. ### N-body simulation

I have a made a fully functional n-body simulation for a project in high school, written in Java. Right now, to "simulate" the solar system, I am simply spawning the different bodies at their respective distance from the sun with an initial velocity calculated by v = sqrt(G*M/r), as shown in...