Recent content by Ortix

thank you gneill! I can now solve the rest of the problems with a breeze!

Homework Statement Homework Equations There is not really a relevant attempt at a solution. I do however have the following question: According to the solutions and some reverse 'engineering' I found out that the voltage across R2 is the same as U1 = 60V. It's been years since I've done...

I'm doing some experiments where I need to calculate the resistance force on a cylindrical body (cable) when it's being pulled through water saturated sand We derived formula from a theory which was originally based on a square body by using stress components. This way we know the pressure at...

Homework Statement I am working on a project where I have to design and size an aquifer. There are two which either store hot or cold water for 6 months which is then pumped up to be used in either the summer or winter. The aquifer is going to be 80 meters under the ground. The rest is...

For my thermodynamics energy project, we are designing a heat- and cooling installation for an office. We are curious whether the outside air humidity plays a big enough roll in the radiation of heat (convection or conduction). We can assume that the office is a box (no rooms), but we do have...

with the unknown force along BC do you mean the normal force inside the beam?

I basically have to solve the system below for which angle theta it's in balance. Meaning all forces equal out to 0. The answer is in terms of the variables. It's been a while since I've done statics like this but it has come back to bite me in the *** again. I started out by moments...

NEvermind the solution can be found here: http://math.stackexchange.com/questions/272155/solve-differential-equation-with-variation-of-parameters

yes but for some reason in the examples and solutions they even take the second derivative of u and they leave it in the equation. It's just that those 2 "parts" are equal to 0 for some reason that is unbeknownst to me and my buds here in the library..

Homework Statement The equation that has to be solved: y'' - y' - 2y = 2e^(-t) The problem I am having is that I don't understand why they equatate that part with the derivatives of the u parameters to 0. (see image) Here they first find the characteristic equation and write down...

Homework Statement I have to draw the step response of the following two systems. G1 = (4+3s)/(s^2+4s+4) G2 = 3/(s^2+4s+4) So I started to draw the step response of the second system first. It has to be in the funky standard form: \frac{ω2}{s2 + 2ζωs + ω2} EDIT: Seems like the above doesn't...

HallsofIvy, you tha man! Solved it! :D

Well I get a=2 but the answer is a=-1 Can't seem to find my error. I've tried it a bajillion times (3 times actually) :)

Homework Statement I have to find for which "a" an eigenvalue for the following system is 0. The system: 1 -1 1 -1 2 -2 0 a 1 Homework Equations My characterstic equation: (1-λ)(2-λ)(1-λ)+2a -(1-λ) -a = 0The Attempt at a Solution I then proceed: (1-λ)(λ2-3λ-2+a) = 0 but then I'm kind...

I think I have to calculate the entropy (s) at 30 bars with x=1. Would that be the correct first step?