Recent content by TheDemx27

Speaking of sight, I've always been interested in eye movement. You never ever see the wooshing eye movement when you move your eyes from one area to another. Your brain just stops formulating and constructing the world for a few milliseconds and just cuts off perception until your eyes have...

Norman Wildberger is a mathematician against the ambiguous rules of infinity and limits, and is against the real numbers in their entirety. AFAIK he is trying to create an alternative to analysis that uses only rationals. I'm currently under the impression that his criticisms are sound but moot...

How did you get that? ##det(A)=cos^2(\theta )sin^2(\theta )+sin^4(\theta )## Which then simplifies into what they got: ## =\frac{1}{2}\ (1-cos(\theta ))=sin^2(\theta )## My question is how they proceed after that anyways.

Basically I don't know how to get to the constraints from the system of equations. In class we used det to find constraints for homogenous equations, but we didn't go over this situation. Someone spell it out for me?

Homework Statement Two waves are produced simultaneously on a string of length L = 1 m. One wave has a wavelength λ of 0.5 m. The other wave has a wavelength λ of 0.2 m. The amplitudes of the waves are the same. At t=0, at what locations x0 is the displacement y(x0) equal to zero? At what...

Thanks for checking me.

That does nothing for me. I was only ever taught the derived forms of maxwell's equations... Treating it as a separable differential equation H=-kA*(dT/dr) I got H=k*4pi*(T_b-T_a)/(1/r_b-1/r_a)

Oh I think I got it. It is just a separable differential equation, right?

Homework Statement A spherical shell has inner and outer radii r_a and r_b, respectively, and the temperatures at the inner and outer surfaces are T_a and T_b. The thermal conductivity of he shell material is k. Derive an equation for the total heat current thought the shell in the steady...

Seeing all this group theory is really exciting, although the problems shown here are quite a bit beyond my reach. I can only do simple proofs I guess. For #1, I believe I found the average distance. Considering only 1 dimension, we have a line upon which we consider a certain point, ##\tau##...

From your link: "To create a plasma takes more energy, and requires a higher temperature than the flame provides. The collisions between atoms need to be energetic enough to kick an electron completely out of the atom."

Expanding on this, what you typically do to find out the coefficients that define a filter is to make a single impulse of magnitude 1, and measure the values that follow after for each sample. For instance, you may have coefficients like 0.9, 0.6, 0.4, 0.3, 0.25... etc. and this is what you...

For number six, the fact that there is a counterexample is especially counter-intuitive. I'd like to see that one solved. edit: oh wait it has been...

https://cloud.sagemath.com/ Insanely valuable. Tons of free tools.

https://media.giphy.com/media/xThuWlHZT7zEPGyYP6/giphy.gif ~success~