Stable Definition and 277 Threads

Homework Statement A 600kg satellite moving in a stable circular orbit about the Earth at a height of 4000km (G=6.67x10^-11 NM^2/kg^2, Re=6380km, Me=5.98x10^24kg). Calculate the speed of the satellite at that height. Calculate the orbital period (T), the time for one revolution Calculate...

im so lost with this question, i have tried a lot and cannot solve it : A particle of unit mass moves on a straight line under a force having potential energy V (x) = x3=(x^4 + a^4) where  and a are positive constants. Sketch the graph of V (x). (a) Find the period of small oscillations...

Homework Statement I'm to design a crane, and therefore I need to find the reactions in the jib and also make the crane stable. 1. I need to find the max. load that the crane is able to lift. Therefore i have to find the reactions where the horisontal and vertical boom is meeting. 2. I need...

The following is the equation for a Keplerian stable orbit at the equator around a Kerr black hole- \tag{1}v_s=\frac{\pm\sqrt{M}(r^2\mp2a\sqrt{Mr}+a^2 )}{\sqrt{\Delta}(r^{3/2}\pm a\sqrt{M})} where M=Gm/c^2,\ a=J/mc and \Delta=r^2-2Mr+a^2 which for a static black hole would reduce to -...

Dont have to be mean?

I've been trying to find the answer to a question i have online but haven't had much luck. Where did Stable or Pertinent magnets get their energy from? I've read plenty of people saying "magnets don't acquire or release energy" but that doesn't make sense to me. Let's use this scenario...

1. In the chair conformation, why would 1-bromo-tetrahydropyran be more stable in the axial position, as opposed to the equitorial position? (Hint: consider how the bromo group affects the attached carbon and what the oxygen could do to alleviate that.) 2. No relevant equations 3...

This is my first post so I hope I'm putting it in the right section :redface: I searched for similar questions but could not find one. Edington preformed his experiment where he observed the bending of light around the sun due to gravity. I have been thinking this past weekend about a...

I've talked to some friends in the field and heard a slew of different things. I was wondering what you guys think about how much job security is offered, and I've heard that engineering is a high demand job - is this true even with the current economy?

Hello I try to get stable dark matter halos with n-body simulations. I set up the halo following a NFW-profile and I define the velocity distribution with a Gauss distribution or Edington inversion (the result is the same). After approximately 2Gyr my cusp turns into a core...?? I use about...

Here's a thought that was bugging me last night: Lets say you placed a very long rigid pole (jokes kept to a minimum please) into orbit so that one end (end #1) faced the center of the earth, and the other (end #2) pointed out into space (So that the center of the Earth and all the points on...

Hello Is it possible to combine two more stable nuclides to form unstable nuclides? like for example combine Xe and Sr and form U In fission it is like U + n -> Xe + Sr + n can we reverse this process? if one doesn't care about the cost effectiveness Thankyou

The commercial toy, Levitron, can achieve stable magnetic levitation due to gyroscopic stabilization and axis precesion. The Levitron toy sold in market has a vertical spinning axis, and so far I have not found a variation with horizontal axis. Is it allowed in Earnshaw's theorem, for a...

If a stable BH exists?. By stable I mean not growing and not shrinking. How then does its radius depend on a homogenious (or inhomogenious?) density outside this BH? I suppose its radius is then anyhow larger than its Schwarzschild radius.

Is it because less force (from, say, potential objects that could tip the object) is required to exert the same amount of torque on objects with higher center of mass?

Hi folks, I have what might be a naive question about the decay of unstable nuclei. I've recently been reading about various decay processes (e.g. beta decay, electron capture etc.). Specifically, I'm wondering if it is ever possible for a stable nucleus (say, carbon-12 or any other...

calculating the stable orbitals for multielectron atoms is so complex that AFAIK it can't be done accurately. so how does the electron in the ground state 'know' that if it jumps to a certain energy level that it will be stable? (which it apparently does know since it 'knows' exactly what...

So I'm an older guy, not horribly old but old enough that I should know "what I want to be when I grow up". I have a B.S. in Computer Science and work in the Consulting industry as an Environmental Consultant. My current job is decent, most people wouldn't complain. I get to travel on the...

Hi, can anyone provide their list of what they believe will be the top 5? Regards

hi I have a question about thermodynamic and kinetic stabiliy. for the general materials we can calculate the free energy and k for evaluation of thermaldynamical and kinetical stabiliy. however, for some strange compond, it is impossible to find the enthalpy and entropy to calculate the fre...

If a black hole really does have hawking radiation can in theory the black hole be stable. What I mean by this is that the hawking radiation output is in equilibrium with mass that we could feed a black hole. It seems to be self explanatory and if the large hadron collider could create a mini...

I've seen the statement repeated in many places that a stable knot comprising 1D curves cannot be created in 4D, since it's always possible to untie the knot by moving in the 4th dimension (whereas it is possible to create a stable knot in 4D using 2D surfaces). Can anyone point me to an...

Assuming that all other conditions are the same, is a short person more stable than a tall person? Is the centre of gravity lower for a short person?

Just curious as to how someone may determine what orbital distances are "safe" or "stable" for planetary interactions? or How close could two planetary bodies get before the gravity interaction destroys one or the other? i.e. Jupiter's Io's orbit places it close to Jupiter, and most of...

got a question Xn+1=X2n-4Xn+6 so from there we play arround with Xs and get roots of Xs =2 or 3 then we sub that into F'(x) giving answers of 2therefore unstable and 0therefore stable i understand all of the question apart from the stable and unstable part could someone please tell me why...

Homework Statement Two small beads having positive charges 3q and q are fixed at opposite ends of a horizontal, insulating rod, extending from the origin to the point x = d. A third small, charged bead between the two is free to slide on the rod. At what position is the third bead in...

Q.Calculate the velocity of a satellite moving in a stable circular orbit around the Earth at a height of 5200km. A. I wasn't sure which formula to use on this problem is it Ac=(V^2)/r

Most stable structure ?? Hi Could anyone tell me which/what is the most stable structure? And Why?? Thanks a lot

below are two simple compounds. this is from a first semester general chemistry test and there were four compounds total all with the same number of C H and O we had to tell which one was least stable and why. I don't remember the other two because both had a formal charge of 0 on everything...

Hi, I am a student currently engaged in AP Physics B and AP Physics C, and I am curious as to why it is that most of the Noble Gases exhibit and exist in such a stable state. In AP Chem last year I learned that having a configuration in which the valence shell of an atom has eight electrons...

I have read it is highly cyclical I have also heard that it is very stable. Is Civil Engineering a stable career ?

Hi all, Biologist posting here. We have a thermal gradient that doesn't seem very stable. Right now, our setup is the following: hot water runs through one aluminum bar and cold water runs through another. the two bars are about 25cm apart. There is a thin aluminum plate resting on the...

to spontaneously develop an instability, i.e. without some external force acting on it?

If G\subset \textrm{End}(V), and W\subset V is a subspace of a vector space V, and somebody says "G leaves W stable", does it mean GW=W or GW\subset W or something else?

can someone explain to me why reactive metals will form stable compounds with strong bonds? any help will be much appreciated

why objects at lagrangian points 4 and 5 are stable? Thank you in advance!

Homework Statement 1) In a sequential process, U(235,92) plus a neutron forms the compound nucleus [U(236,92)]* which then fissions; the fissions then produces decays. If the initial fission fragments are Ba(143,56) and Kr(90,36), illustrate a process leading to the final stable nuclei...

Basically, I'm having difficulty understanding the concept of stability, I have reread the chapter in my book various times, but to no avail. Can anybody give a very brief overview in simplified terms as to what determines whether or not a matrix is stable. Thanks.

Hi, I am new member of this forum, and I have one question for you. When the atom have 8 electrons in the last shell, why it have stable configuration? What makes the atom to be stable and what makes the atom to be reactive? I know few things about this. Generally speaking the CH2 molecule is...

Homework Statement Consider a dynamical system x(t+1) = Ax(t),, where A is a real n x n matrix. (a) If |det(A)| > or equal to one, what can you say about the stability of the zero state? (b) If |det(A)| < 1, what can you say about the stability of the zero state? Homework Equations...

Homework Statement Show using a probabilistic method that a graph with average degree d has a stable set of cardinality at least n/(2d). I can't think of a probabilistic method that will do this.

Trans-uranium element production is more often confirmed from decay products. But would such a new atom be overlooked if stable? Recently, element 118 occurred in one out of 1019 collisions, and was most readily detected by its signature radiation.

"stable equilibrium" Homework Statement Is there a difference b/w stable equilibrium and just equilibrium (of charged particles)? My homework problem exactly is: 2 small beads with charge +3q and +q each is fixed at opposite ends of a horizontal insulating rod. If a third charge is placed in...

Say we have two objects. One is at the origin with mass = 1kg, the other is X meters away with mass 0.1kg Is there a way to calculate the velocity required to form a stable orbit, depending on the distance of the smaller object?

This is not a very comforting new. It appears that one of the ceramic material used for storing nuclear wastes http://www.nature.com/news/2007/070108/full/070108-6.html" than first thought. The damage done by the emitted radiation, especially from alpha and its collision byproducts, are damaging...

Homework Statement A cube of sides B sits ontop of a hemisphere of radius R. Determine the conditions such that the cube is in a stable equilibrium. Homework Equations A stable equilibrium is one in that the second derivative of the potential energy function is positive. U = mgh...

Which of the following is most stable. Ortho, meta, or para benzene? Also, why is this the case. Thank you in advance

Hi I some need of urgent assistance to show the following: m(\epsilon) is stable under a countable sum. Please can somebody explain this to me? You Guys are my only hope ! Sincerely Yours Hummingbird25

For an experiment I need to achieve a stable axis of permanent levitation. Due to how magnets function I can't exactly go about this a simple way and my best bet is to probably go with a sort of eletromagnetism. I was thinking about buying one of those $80 floating globes, taking it appart and...

free neutrons are unstable: would a muon in say uranium be "stable"? free neutrons are unstable: would a muon in say uranium be "stable"? free neutrons decompose and have a half-life of about 15 minutes. neutrons bound in a nucleus, especially in a magic shell configuration like helium-4 or...