Orbital Definition and 790 Threads

Homework Statement The observed period of the binary system Cygnus X-1, presumed to be a bright star and a black hole, is equal to 5.6 days. If the mass of the visable (the star) is 20*Mass of the Sun, and the black hole has a mass 16*Mass of the Sun, show taht the semimajor axis of the orbit...

Where can I find the orbital velocities of Earth at its perihelion and aphelion? Thanks.

I don't think the problems I'm going to post are very difficult, but I'm totally clueless regarding chemistry, so they're pretty difficult for me ^^;; I also have a lot of questions to ask, so I hope you don't mind my sticking them all into one topic. I'm looking forward to your help. You don't...

I was reading Gullivers Travels to my son over Christmas and in a voyage to Laputa there is a passage illustrating their prowess at astronomy. The passage goes: Not being an expert in planetary physics I was wondering is this passage: a) Correct, in which case what are the actual...

Hello! First I am new at this forum and would like to say hello to everybody :) Second- I am looking for a good tutorial on artificial Earth satellites orbit perturbations. Can somebody give me an advice where I can find it? Do you know any propagation algorithms for artificial satellites that...

Hello, I plan to write a (modest) orbital simulator in C++, I am an experienced developer with an average knowledge of classic physics; I would like to have some recommendations (recommended book reading, eventual existing C++ libraries that can help) before starting knowing that I need...

According to molecular orbital theory, which of the following species is the most likely to exist? a) H_{2}^{-2} b) He_{2} c) Li_{2} d) Li_{2}^{-2} e) Be_{2} I think the answer is c), due to it having a bond order of 1, but I just wanted to make sure.

If I want determine the specific orbital energy of something orbiting a black hole, will the vis-viva equation still apply? Or will it apply if I replace the euclidean coordinate rwith a radial coordinate? None of the above? If the answer to the second question is yes, then what do I make of...

Homework Statement Two planets A and B, where B has twice the mass of A, orbit the Sun in elliptical orbits. The semi-major axis of the elliptical orbit of planet B is two times larger than the semi-major axis of the elliptical orbit of planet A. What is the ratio of the orbital period...

Hi everyone, was hoping someone could help me to answer a question: an ateroid has an equilibrium temperature measured as 200 K. What is the object's orbital period around the Sun? That is the exact wording of that particular question and that's why I am a little stumped.. it also says...

Homework Statement Hi everyone, was hoping someone could help me to answer a question: an ateroid has an equilibrium temperature measured as 200 K. What is the object's orbital period around the Sun? That is the exact wording of that particular question and that's why I am a little...

Hi, I'm having a lot of trouble with the following question. Answer: ([SIZE="4"]σ1s)2 ([SIZE="4"]σ*1s)2 ([SIZE="4"]σ2s)2 ([SIZE="4"]σ*2s)2 ([SIZE="4"]π2py)2 ([SIZE="4"]π2pz)1 If anyone can tell me how to obtain this answer, I would be very happy. Thanks.

Mars travels around the sun in 1.88 (earth) years, in an approximately circular orbit with radius 2.28 x 10^8 kilometers determine a)orbital speed of Mars relative to sun b)mass of the sun.. for part a) i did v= 2(pi)(r)/ T which i got 2(3.14)(2.28x10^11 meters)/ 5.93 x10^7 seconds...

I'v been trying to work out this question for ages, but nothings quite working for me, here goes.. q. a) calculate the orbital radius of a synchronous satellite (one period of 24hr, so appears stationary above anyone point). Approximately how many radii of Earth is this orbital radius? Why...

Find the orbit radius of an Earth satellite in a circular orbit if the period if 1d. I'm at a dead end. So far I have; r^3 = (GMT^2) / (4(pi)^2) r^3 = (6.67*10^(-11) * 6*10^(24)) / (4 * pi^2) and I get r = 21642 The book says 42.2Mm. I'm only off by a couple of million meters...

Hey guys. Could someone please explain orbital decay to me, with reference to the kinetic energy lost, and stuff like that. Also i would like to know how the equation for mechanical energy in orbits is derived, and how it is used. Thanks!

For the pairs below, I need to name the orbital they describe... I just am checking that I am on the right track: a) n=5, l=0 >> 5s b) n=3, l=1 >> 3p c) n=4, l=2 >> 4d if those are not correct, can someone lead me in the right direction?

What is the magnitude of the orbital velocity of the planet Mercury (orbit radius =5.79 * 10^{7} {km}, orbital period = 88.0 days)? Ive been trying to solve this using this equation v=(2pi(57.9*10^9m))/(7.6*10^3)s but it is not coming out right...the numbers in the equation are the units in...

The books said that total magnetic moment of an electron is spin + orbital magnetic moment. But is the orbital magnetic moment realistic quantum mechanically? I thought electrons dosen't have a trajectory. The Stern Garlach experiment showed that silver atoms only split into two paths after...

In a molecular orbital diagram that shows the bonding of two electrons (like a diatomic molecule), there are sigma and pi bonds, and the sigma and pi antibonds. Here is an example: http://www.westga.edu/~chem/courses/chem410/410_09/sld024.htm I don't understand how to determine where to put...

Hi all, I've got some conceptual questions that I need to clear before my exam I hope someone can help me out here. I understand that a geostationary satellite must orbit in the plane including the Earth's centre, in order to stay above a particular surface of the earth. However, can a...

If ocean levels go up enough, will they have an impact on the Earth's rotational speed and the Moon's orbital radius? If so what will the effect be? It seems that all these things are tide to one another.

This is really cool. [PLAIN]"[MEDIA=youtube[/URL] I notice the balls change speeds proportionate to their height on the wall as they follow their elliptical paths. Does their speed follow Kepler's 2nd Law?

(unrelated to my other post about an asteroid) 1] I would like to check a postulation with someone who has an orbital simulator, or a good head for orbital mechanics. Given an object such as a comet with orbital period of about 150 years, could it have a perihelion at a distance between...

I don't know how to answer this question without a given altitude, but since one isn't given then I probably don't need one. Any ideas? Determine the minimum velocity an Earth satellite must have in order to purse a stable orbit without falling to the ground.

Here's an interesting question inspired by a homework probem (not mine) - what is the orbital period (proper time) for someone in a circular orbit around a black hole as a function of the radius of their orbit (Schwarzschild r-coordinate). By setting the derivative of the effective potential to...

Ok so the total energy of a body following a given trajectory around a much larger body (eg. Earth and sun), is described by : E(total) = (1/2)mv^2 + U (where U = grav. potential energy) E(total) = (1/2)mv^2 - (GMm)/r (1/2)mv^2 can then be expanded to give : E(total)...

Hi all, The Final Theory" by Mark McCutcheon offers a lot of new (strange) thinking, but can anyone out there, in laymans terms, and assuming one is familar with "The Final Theory", tell me how the heck orbits are done, ie, Moon around the Earth? If the whole universe is expanding, how do...

This just in: They just re-acquired signal with the MRO after it went around the far side of Mars. They are waiting to ensure it is in the correct orbit right now.

I'm a bit unclear about the description of orbital motion in a plane by using the polar coordinates (r,\theta). This coordinate system changes its orientation in the inertial reference frame, that it is rotating as the orbiting object moves along its path. In the derivation of the equations of...

Hello, Let's consider a small 3 planet system. One of the planet's is fixed and is a lot heavier than the others. The acelleration is mP2 * aP2 = - FP3 - FP1 From with the velocity is derived with allows to calculate the positions of the planet's in a simulator program. After running the...

I am reasonably familiar with conventional elliptical orbits under gravity but how do they change as orbital velocities get very fast and start approaching the speed of light? let us initially neglect any energy losses due to gravitational radiation. I have been searching the web for some time...

p orbital, π bond, and lots of questions :) I’m a little bit confused, and I APOLOGIZE if I’m asking too simple and stupid questions. OK, we have two atoms, each with one p orbital (8), occupied with one electron and they form π bond. You all know how π bond looks 8=8, and I wondered why...

Is this true? (excerpted from http://www.astro.uni-bonn.de/~bertoldi/ub313/" about 2003 UB313) "...Its very elongated orbit takes it up to 97 times farther from the Sun than is the Earth - almost twice as far as the most distant point of Pluto's orbit – so that it takes twice as long as...

hey where r my recent posts on orbital properties and electron energies?

I had to buy a new orbital sander today. The instructions warn not to use it around dust.

Hi. I'm having some trouble trying to grasp a concept. I know that mathmatically Force perpendicular to motion is zero work. I can't seem to grasp this conceptually. First It seems That is an object is moving right and a force acts straight up on it, it will cause the object to move in a...

Consider the Earth's orbit around the sun to be in a plane A and the moon's orbit around the Earth to be in a plane B. How do these planes intersect? Are they parallel or perpendicular? At what angle do they intersect themselves? Does the angle stay the same, or does it vary.

Hi, I need to calculate and visualize molecular orbitals (HOMOs) of few simple organic molecules (may be using DFT method). The molecules are positivly charged. Can anybody please help me with this calculations?

The position of a particle of mass m moving in a circular orbit with radius r = ro is given by: r(t) = ro <er> Show using Newton's second law of motion, that if the force responsible for this motion is given by: F = -k/r^2 <er> a) the angular velocity is constant in time, and b) the...

Hi. I have been trying to find the MO diagram for BrF5 since it is not in my textbook. I have been searching the web, and Google but I haven't been able to find anything, if someone knows of a MO diagram on the web I would be thankful If you would tell me where to find it.

A rocket is 1.00x10^10m from a moving star moving at a speed of 1.00x10^5 m/s with a total energy of -1.67x10^17 J when it experiences a gravitational force magnitude of 6.67x10^7 N. It turns on its thrusters and its speed as well its distance to the star doubles by the time the thrusters are...

why my answer is wrong? --- remove electron from orbital question: In forming Ni+ and Ni2+, the nickel atom loses electrons from which orbital(s)? I looked at the periodic tale, and Ni is in the middle, where the 3d orbital located. so when you need to remove one or two electrons, you...

Unless you have orbital geometry down cold this might take a little thinking. SET UP A large independent planet with a thick atmosphere included is 100 Mega-meters in diameter. Beyond that diameter we can consider that we have a real vacuum outside that diameter. “Independent” only means...

I used to understand this -- a few years ago -- but it has completely slipped my mind. What is going on with al this 1s2 and Like Cs[Xe]6s1? Thanks a lot, Mk

Is there anyone who knows the answers of these two long-standing questions? 1. How can the orbital electron rotate permanently without energy supply? 2. How can the orbital electron keeps its position without merging into its nucleus when an external pressure applied on it if its kinetic...

Hello, I need help on deriving a equations for the moon's acceleration around the earth. I've already found the total acceleration (a=Gm/r^2) but what i need to do is split this acceleration up into its x and y components, and derive equations in terms of a, r, x, and/or y for any given position...

Suppose there is a planetary system in which a planet with an average distance of 6 AU from the star has an orbital period of 3 years. What is the mass of the star? The answer should be in SOLAR MASSES. I tried to use the formula: P^2 = (4pi^2*a^3)/G(m+M) but it didnt work:( any...

To make the moon deviate from it's straight line path requires a force and I assume this force requires energy. Considering the mass of the moon and the billions of years it has been orbiting the Earth this seems like a tremendous amount of energy expended. With regard to the conservation of...

Am very interested in why the inner shells have 2 electrons, the next couple have a couple more, and the rest all the same. If you would like to argue that its related to the diameter of the orbit then of course you have MAJOR issues to deal with. This is important and I'm hoping...