Stability Definition and 478 Threads

In terms of electronic structure, Fe3+ is more stable than Fe2+ because it has a half filled d-orbital which gives extra stability. i.e. Fe3+ : [Ar]3d5 Fe2+ : [Ar]3d6 But the standard electrode potential of the following reaction is 0.77V, Fe3+(aq) + e- => Fe2+(aq) which means...

Ok, here is an idea I have been playing around with for about 2 months now: i am design a RC aircraft that is lifted verticaly into the air by 4 ducted fans. however an issue with stability came up, so instead of trying to rely on a low center of gravity alone for the stability, I came up with...

Determine the asymptotic stability of the system x' = Ax where A is 3 x 3 matrix A = -1 1 1 0 0 1 0 0 -2 ( first row is -1 1 1 second is 0 0 1 and third is 0 0 -2) More specifically, what stability conclusion(s) can be drawn? ( Justify your answer)

I am verifying and validating a rotational state propagator used in a dynamic simulation package. I have found some problems and solutions to them. This post outlines the propagation, the problems, and the solutions. Some questions before I start: - Has anyone else analyzed stability and...

Why are Bicycle wheels the same size? Is it because it is easier to manufacture and maintain or does having same wheel sizes in the front and back offer added stability when compared to having a bigger wheel at the back (like the early models)?

Would it be too chaotic to allow for stability to arise? would it be "dead"?

Can a circuit that has transfer function with poles in right-hand side part of the imaginary-real plane (unstable system) have resonant frequency?

in quantumdynamics, the stability of electron of H atom is a hypothesis. but if electrodynamics is right in quantum theories, electron circling a H atom will emit energy, then how can electroquantum theory give a sound prove of the stability of electron? thanks.

Hello, I am wondering about the real explanation that atoms have a tendency to have higher stablity with a full valence shell. What forces are at work here besides the 'happy' atom. -Scott

I have another question about stability, it kind of leads on from the other topic that I posted. On bifurcation diagrams, you typically see a series of 'forks'(or branches) and the number of forks for a given interval usually increases as you move from end to the other doesn't it? I'm...

Hi I am unsure about stability of fixed points here is an example. x_{n + 1} = x_n There are fixed points at x = 0 and x = 1. In general when talking about difference equations and whether a fixed point is stable or unstable, does this refer to points in a neighbourhood of those...

I've heard many people on these forums claiming Il is crazy, a psychopath, or other such things. I havn't seen or heard any such reports about him having any such condition anywhere. How true is this? How much is just fear mongering?

Let's continue here, Smurf.

Hi. This may be really basic, but would appreciate your help. Is a tower whose height reaches a geostationary orbit at 35,000km's altitude or so more stable that one which doens't quite reach that height? So, say you are building a tower, decide you'd like it more stable, so should you go...

hi i've a problem with the definition of static margin and the role of horizontal stablizer on static margin, is ther anyone to help me thanks erkan

I remember hearing somewhere that one of the reasons people are trying to make elements which high atomic numbers is to see if they can be made to have long half-lives, such as uranium. In effect, they're virtually stable. However, I don't see how that can be. Here's why. Suppose element...

A uniform, horizontal flagpole of length 5.00 m and with a weight of 195 N is hinged to a vertical wall at one end. A stuntwoman weighing 600 N hangs from its other end. The flagpole is supported by a guy wire running from its outer end to a point on the wall directly above the pole...

Within the context of the equation: CH4(g) +2O2(g) -> CO2(g) + H2O(l) delta H = -890 KJ What is the difference between Thermal and Kinetic stability? I knew the answer before, but i forgot now. Forgive me for just memorising the answer, but its a temporary solution. Any help would be...

Three rods with length l and mass m are arranged like the figure in the attached file. There connections are without friction. One rod is horizontal and the other two parallell and in the same plane. An elastic string connects point A and B. The tension in the string is proportional to its...

Hi there. I have got very good help from this forum in the past and I have yet another question. Take a square platform with a thruster at each corner. Put a weight in the centre of it. Now, with the weight in the centre the platform is stable but as you move the weight to one side the...

Consider the following algorithm for computing the area of a triangle with sides of length A, B, and C: S = (A+B+C) / 2 Area1(A,B,C) = sqrt(S(S-C)(S-B)(S-A)). A) Explain why this approach is unstable, and illustrate with an example. B) A student proposes the following less...

I am doing a project for my physics course...I have to design a device that uses electromagnetism. I'm thinking of doing something "different" rather than the boring bells/radios etc.. Would a small-scale model of a maglev train be feasible in everyone's opinion? I am planning to build a...

Does anyone know what it means to say that the frequency stability of a laser is 2 parts in 10E10, I gather that it means that the frequency shifts 0.02nm each side of the mean wavelength. But I can't find any resources that use the term parts.

Hi. What prevents proteins from falling out of cell membranes? This question has been bothering me for sometime... and I cannot find an answer to this. Please help :-p

Stability of "spin top" (tippy top) I'm looking for a decent discussion of the stability of a spin top (sometimes called the tippy top), which shows that the stable configuration when spinning is the "inverted" one (spinning on the stick). Any help would be appreciated.

A uniform triangular lamina ABC where AB = 1m and BC = 2m and it is right angled at B. It is suspended from C and hangs freely under gravity. Calculate the angle between BC and the downwards vertical. Need help fast pls cheers:smile:

Why don't Germany and France have to comply to the rules? According the the stability pact, a country in the EU is not allowed to have a budget deficit larger than 3%. France has 3.5% and Germany 4%, in a meeting last night the other EU countries voted on the issue. Spain, Finland, Austria...

Do protons decay or are they completely stable? If they do then what is their half-life?