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    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...
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    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...
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    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.
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    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...
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    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...
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    Standing waves in tube closed tube

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

    Sorry, the water makes up the closed part. The opening is open.
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    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...
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    N-body simulation

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

    Thank you!
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    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
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    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...
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    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...
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    Newton's Law of Cooling

    If the temperature of an object with temperature T(t) is place in a room with the ambient temperature Ta, Newtons Law of Cooling is defined as dT / dt = k (T(t) - Ta), correct? This implies we would need a negative k-value. Wouldn't the equation therefore be described better if T(t) and Ta...
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    Other Books on problem solving

    Thank you! I think I'll order: https://www.amazon.com/dp/0071763465/?tag=pfamazon01-20 https://www.amazon.com/dp/0071754873/?tag=pfamazon01-20 Although, do you think it is necessary to practice problem solving based on pure math, or will problem solving based on physics involve all the...
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    Other Books on problem solving

    I am leaving high school (or Sweden's equivalent) and I will be entering a hard physics / math program at university this fall. I feel like I understand all the concepts in maths and physics, but I would like some practice on pure problem solving since that is really what I am interested in...
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    Momentum 2d

    Oh god this is embarassing, how could I miss that. Haha well thank you :)
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    Momentum 2d

    Homework Statement The problem is stated here (from brilliant.org) http://i.imgur.com/MkWwnjT.png Homework Equations momentum = mass * velocity The Attempt at a Solution My attempt at a solution can be found here: http://i.imgur.com/Zsco86W.jpg I get the answer 0.035kg, but that is not an...
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    Force on a particle in a homogeneous electric field

    Thank you! I makes complete sense now :) Sorry for late reply, was busy studying for the test lol
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    Force on a particle in a homogeneous electric field

    I understand that in a homogeneous electric field, the force on a particle, regardless of its location, is the same. How can this be? Wouldn't a positively charged particle experience a greater force when near the positively charged side? What am I missing?
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    Why does velocity increase force according to F_m = QvB?

    This is probably a very noob question, but I can't seem to get my head around it. Why does an increase in velocity of a particle in a magnetic field, increase the force acted upon it, according to F_m = QvB? For example in orbital dynamics, an increased velocity of a body simply breaks the...
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    Orbital Dynamics

    Oh, really? Nice. It seems easy on one hand, but I've also read that it is extremely hard to do a n-body simulation with more than 3 bodies due to the fact that the motions become so random, sort of like a double pendulum...
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    Orbital Dynamics

    Hello. I have a project in school in which I will be attempting to gain an increased understanding of orbital dynamics and the maths related to it and using this information to create a n-body simulation. I have a like 3-4 months to finish it and I'm currently in high school so I am only...
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    Study in the US

    Thank you for this very informative reply! Is there any way I can prove I am good at programming, I guess they won't take my word for it. And also, what kind of extracurricular activies look good? I am into politics and I've been thinking of joining a political youth movement, would this...
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    Study in the US

    Can anyone share some knowledge on this topic? I could really use some help. And also, are there other countries which offer the same quality universities as the US?
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    Study in the US

    Hello. I am graduating next year (i'll be 19) in Sweden, and I am interested in studying at a university in the US, but I am afraid I will not get accepted. My grades are sort of good (although I am not satisfied at all). The maximum score is 22.5 which is equal to straight A's, and I will...
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    Ideas for physics project

    Wow, that sounds really interesting acutally. Maybe I could add some realistic graphics too. Keep the ideas coming, I need a few to discuss with my teacher!
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    Ideas for physics project

    Hello. First off, I am sorry if this thread is in the wrong category, I did not really know where to put it. Now to the problem. It is my last year of high school this year (well, Europe's equivalent), and during this year we are supposed to choose and work on a big project and it has to...
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