Recent content by Aesteus

"Maybe it will be safer if you got to do this project with someone who can understand electronics and will be sitting next to you -- maybe even doing most of the work. I mean it, not in a menacing way, but in a considerate one." You know ... I understand electronics pretty well, and I just...

More questions about a singing arc http://www.volny.cz/jmartis/flyback_singingarc.png I've successfully constructed a singing arc prototype, and now I'm building the final design in the schematic above. Previously, I had an issue with delivering 60V at 2A to my circuit, but I've solved this...

Alright, so I'm building the singing arc that's in this schematic. http://www.volny.cz/jmartis/flyback_singingarc.png Now my first problem is obtaining a 60 volt input. Will I get a usable 60 volts (consider current spikes) if I bridge rectify a 120 volt wall current, obtaining a -60 and...

Ah I see now. And I think part of the problem is that it's 5 a.m. here. :) Also, do you think you can help me out with my other frequency problem? It's about finding angular frequency from potential energy. I've hit a mental wall. https://www.physicsforums.com/showthread.php?t=593279

:) very good The problem is that I'm trying to switch back to x from my z-based frequency equation ω=(k/M)^1/2. And how do I do that? .... Or is there another way?

Homework Statement A mass M is suspended from the ceiling by a spring with spring constant k, and from the floor by a spring with spring constant 3k. Find the frequency of the mass' oscillation. Homework Equations F=ma The Attempt at a Solution F(net) = Mg + kx - 3kx = Mg - 2kx performing...

Arghgagh ... there should be a prime in the original potential energy equation above. I corrected it. Thanks. -But the values of x = β and -4β are still correct.

But how does that help me solve for angular frequency? I have already found the equilibrium positions where U(x) is concave.

Homework Statement Alright so I've got a potential energy equation U(x) = E/β^4(x^4+4βx^3-8(β^2)x^2) and U'(x) = E/β^4[4(x^3) + 12β(x^2) - 16(β^2)x] (where β and E are constants) that describes a particle of mass m which is oscillating in an energy well. I solved for where the system has...

Homework Statement 1st terms = -e and positive e separated by d. 2nd terms = Two units of charge e form a system of 3 point charges -e, 2e, and e (all d apart). The next terms are formed by changing the sign of the charge and then moving by one unit length. Homework Equations E=q(1)q(2)/d^2...

Nevermind, it's just a simple application of gauss' law on the inside of the object yielding E=0 because there is no enclosed charge. (And E-z is non-zero I believe.)

Homework Statement Find the electric field inside a hollow non-conducting pear with a surface charge-distribution (axially symmetric too) of σ(r,θ). The charge density σ is zero at the top of the pear, and 600 C/m^2 at the bottom. Homework Equations I'm not sure how to approach the problem...

Anyone have an idea?

Homework Statement Calculate the total charge embodied in a solid with charge density that decreases linearly with height from a value of λ at the bottom to 0 at the top. Solve for a rectangular prism and a sphere. Homework Equations ∫∫∫ρdxdydz ∫∫∫pr^2sinθdrdθd∅ The Attempt at a Solution...

Homework Statement Using integration by volume calculate the potential energy of a uniformly-charged sphere with total charge Q. I assume the sphere is solid with uniform charge density. Homework Equations U=(1/8pi)*∫(E^2)dV The Attempt at a Solution My problem is that when I attempt to...