Orbit Definition and 1000 Threads

I got myself here a satellite rotating at a large distance around planet X. Distance from center of planet X = 100, mass of the satellite = 1 gram (really small), mass of planet X = 1.0 kg velocity of my satellite 10 m/sec and in this oddball universe the gravitational constant = 10**4...

Could someone please explain how I work with $-mf(r)e_r$ in this question. Usually we get given an equation (like the one for f(r)) and have to work out the orbit by getting a differential equation etc. I'm not too sure how to work it this way around. [FONT=verdana]"A particle of mass m moves...

What gives the electron the apparently necessary energy to keep orbiting the nucleus for the vast time periods that this has occurred for? The electron is a moving charge, so is there a potential difference making the current flow? Is this something to do with the field of the proton? I...

Do electrons all orbit an nucleus at the same distance? I.e is an 's' cloud always the same in every atom or does the chance of finding one closer or further to the nucleus change? What about when the spin opposite electron enters the shell?

Recently, I attended a lecture at my university entitled "The Life and Death of a Star-Grazing Comet" presented by John Raymond, an astrophysicist at Harvard Smithsonian. In this lecture, he talked about Comet Lovejoy and how it allowed us to help study the corona of the sun. As the comet was so...

Does the moon's orbit depends mainly on the gravity of Earth and the distance between it and between earth?

Let's say I'm on a planet and I have a space "gun" that can launch an object upwards at any speed in any direction. Typically with this, you could not launch an object without any rockets into orbit because the best you could do is make the object loop around the planet to exactly where it...

Homework Statement The figure illustrates a Keplerian orbit, with Cartesian coordinates (x,y) and plane polar coordinates (r,φ). F = -(G*M*m)/r^2 The parametric equations for the orbit: r(ψ) = a ( 1 − e cos ψ) tan(φ/2) = [(1+e)/(1-e)]^(1/2)* tan(ψ/2) t(ψ) = (T/2π) ( ψ − e sin ψ) where ψ is the...

##\mu_{sun} = 132712000000## ##\mu_{earth} = 398600## ##\mu_{mars} = 42828## ##R_{earth} = 149.6\times 10^6## ##R_{mars} = 227.9\times 10^6## ##r_{earth} = 6378## ##r_{mars} = 3396## The spacecraft will make 3 rev in 2 Earth years. I found the semi-major axis of the ellipse which is...

can a photon have a perfectly smooth orbit? say for e.g. you have a photon orbiting a point, if its wavelength were to become twice the diameter of its orbit then would the wave not become a replica of the orbit offset by the amplitude? similarly say the amplitude is the radius of the...

While the mean speed of the Earth on its solar orbit is about 30km/sec, what is its approximate speed during the both equinoxes and the both solstices ?

Homework Statement A particle of mass m is moving in a repulsive inverse square law force ##\mathbf{F}(\mathbf{r}) = (\mu/r^2)\hat{r}##. Given that ##u(\theta) = -\frac{\mu}{mh^2} + A\cos(\theta - \theta_o)##, 1) Determine the paramters of the (far branch of the)hyperbolic orbit...

Are we just really lucky that the time it takes for Earth to orbit the sun is 365.25 days? I mean if it was something like 365.71 days, then we couldn't have our simple leap year every four years. We would have to have a 71 leap years every century, or even if we were to simplify it a bit, 7...

A satellite is in a circular orbit very close to the surface of a spherical planet. The period of the orbit is 1.94 hours. What is density of the planet? Assume that the planet has a uniform density. density = kg/m^3 T = 2∏/ω = 2∏r/v GMm/r^2 = (mv^2)/r v^2 = GM/r v = rω So I know I...

Homework Statement A satellite is in an elliptic orbit around the Earth. Its speed at pedigree A is 8650 m/s. (a) Use conservation of energy to determine its speed at B. The radius of the Earth is 6380 km. Use conservation of energy to determine the speed at the apogee C. Homework...

Homework Statement A particle of mass m moves under the influence of a central force $$\underline{F(r)} = -mk\left[\frac{3}{r^2} - 2\frac{a}{r^3}\right] \hat{r}$$ The particle is projected from point A, at a distance a from the centre of force O, in a direction perpendicular to OA, its...

If electron waves weren't standing waves in Bohr's circular orbit, why and how would the waves interfere ?

Homework Statement Hi, I have a question on my homework that I'm absolutely stuck at. I'm not sure how to go about this. Can someone help me through the steps to solve it? there are more after this similar to it so learning how to do this one would help me do the other ones by my self. Thanks...

The space shuttle is moving in a circular orbit with a speed of 7.8km/s and a period of 87min. In order to return Earth, the shuttle fires its retro engines opposite to its direction of motion. The engine provide a deceleration of 6m/s^2 that is constant in magnitude and direction. What is the...

1. At what altitude will a satellite complete a circular orbit of the Earth in 4.4 hours? Homework Equations T^2 = ((4π^2)(r^3))/GM The Attempt at a Solution Used the equation and plugged all the information, and solved, but for a weird reason it comes wrong, maybe I should...

Homework Statement I'm studying small oscillations. When can I say that an orbit is closed? The Attempt at a Solution I remember that there is a ratio that must be a rational number but I don't remember other thing... Thank you!

Hello, The problem is quite simple.You are an astronautics engineer in an established colony on europa,one of jupiter's moons and your boss asks you what would be the minimum velocity so that a cargo full of wastes or garbage is placed on a parbolic (neglecting the mass of europa versus the...

I don't know if you are familiar with it, but in pertubationt theory for hydrogen it is handy to look for eigenstates of J = L + S since this commutes with the hamiltonian (L and S are not separately conserved). My book then says that the good quantum numbers are: n,l, j, mj I must admit I'm...

I have a question about how my book derives a formula. It starts with: We have an electron free too move on a cylinder and from the cylinder there is an electric field pointing radially outwards. Now for an electron moving in an electric field it sees local magnetic field given by: B =...

Homework Statement As a spacecraft of diameter 2.8km approaches Mars, the astronauts want to experience what their Mars-bound weight will be. What should the period of rotation be to simulate an acceleration due to gravity of magnitude 3.8 m/s2 ? Mass of Mars = 6.37*1023 Radius of Mars =...

I cannot understand why the electron orbit should be an integer multiple of De Broglie wavelength. Why should the wave path "fit" the electron orbit for it to be stationary?

Homework Statement Which is greater, the frequency of the Moon’s revolution about the Earth, or the frequency of Earth’s revolution about the Sun? How much (factor) greater? Homework Equations f=1/p p=period The Attempt at a Solution Earth= 1 Revolution/365 days (1 rev/31536000...

Let's say a craft is in an orbit at a height h above a planet or moon. A force acts directly against the craft's direction of motion so as the force vector is always parallel to the surface of the central body. So, the craft will slowly decelerate and impact the surface. What would be the best...

Homework Statement A 1 034-kg satellite orbits the Earth at a constant altitude of 102-km. (a) How much energy must be added to the system to move the satellite into a circular orbit with altitude 191 km? (b) What is the change in the system's kinetic energy? (c) What is the change in...

Determine the location of the point(s) on an elliptical orbit at which the speed is equal to the (local) circular orbital speed. Determine the flight path angle at this location. What equation(s) should I be using or thinking about for this?

How does one use the energy equation to determine the type of orbit? $$ E = \frac{v^2}{2} - \frac{\mu}{r} $$ where $\mu = G(m_1+m_2)$ and $$ \mathbf{r} = \begin{pmatrix} -4069.503\\ 2861.786\\ 4483.608 \end{pmatrix}\text{km},\quad \mathbf{v} = \begin{pmatrix} -5.114\\ -5.691\\ -1.000...

Basically, my understanding is that every satellite that is not at a lagrange point will see its orbit eventually decay and it will crash back into the earth. Could an ion engine be set to fire at certain times to offset this? Because the rate of decay is slow, an ion engine might be up for it...

As I figure [and have consulted with some physicists], there no reason why this would not work: object orbiting a planet in one direction, then, half way trough, hits something that propels it in the other direction [at orbital speed, of course], orbits the planet the other way around and hits...

Hello, Here's my challenge: I want a physics model for how one would go about in order to decay the moon's orbit. I'm assuming it would involve using the velocity vector of the moon whereby Earth would be a reference system, coupled with the mass, and devise a theoretical way of degenerating...

Homework Statement I want to Plot a Orbit using only the Orbital Elements. The orbit will be two dimensional, so I think some elements will be discarded. Homework Equations The Attempt at a Solution

http://news.discovery.com/space/asteroids-meteors-meteorites/lets-put-an-asteroid-into-lunar-orbit-130111.htm Basically, wouldn't any object that orbited around the moon gradually see its orbit be made more and more eliptical until it crashed into the moon itself? Also, it actually takes...

Does the milkyway orbits anything ?? like sun orbiting center black hole of our galaxy Does the milkyway orbits anything ?? like sun orbiting center black hole of our galaxy i have this question bcoz our moon moves towards(orbiting) Earth but can't reach or hit Earth bcoz Earth moves...

My understanding is that generally with space flight, when you accelerate in the direction of orbit, you don't go around the Earth any faster but instead ascend to a higher orbital plane, which arguably has a longer period of orbit. Is there any manuver method that let's you move around the...

I had a thought. Without friction, the conductor in between the magnet would spin indefinitely in orbit (free of gravity). Tell me where I am going wrong

I a question regarding an object, that is originally in geosynchronous orbit, but then thrusted straight down. Will the object land directly on where it was hovering over while in the geosynchronous orbit? Or will it land off target because, as it falls, it's relative position to the Earth is no...

Homework Statement #1.) A rocket exhausts fuel with a velocity of 1500 m/s, relative to the rocket. It starts from outer space with fuel comprising 80 per cent of the total mass. When all the fuel has been exhausted the speed is... (Answer was 2400 m/s) Homework Equations Vrel...

Homework Statement If a new planet has a year of 3.44578 Earth years, what is its radius of orbit in meters if Earth's orbital radius is 149,597,870,700 meters? Formula: r = (vt)/(2pi) How can I use this without velocity? All help is appreciated as I'm not sure how to go about this...

Hello, this is my first topic/question, thanks for reading thus far... It is very easy to find explanations about the general path that the solar system takes when it orbits the center of our galaxy, when viewed in 2D from above, a circle around the center some distance away from that center...

Homework Statement You can determine the velocity of a satellite in uniform circular orbit by applying Newton's second law, Newton's law of gravity, and the centripetal acceleration due to gravity. Which of the following is not correct? a) The orbital radius r and the speed v cannot be...

1(a) Homework Statement A spaceship travels in a circular orbit around a planet. It applies a sudden thrust and increases its speed by a factor f . If the goal is to change the orbit from a circle to a parabola, what should f be if the thrust points in the tangential direction? 1(b) Is...

Comets travel around the sun in elliptical orbits with large eccentricities. If a comet has speed 2.5×104 when at a distance of 2.3×1011 from the center of the sun, what is its speed when at a distance of 5.9×1010 . Using Kepler's Law T2 is proportional to R3 T2/R3 is a constant (C)...

Hi I am studying how the spin orbit interaction in certain materials can lead to topological insulator effects and realize it has something to do with the effects of the SOC on the band structure of the material (Bi2Se3), possibly due to the inversion of the valence and conduction band but I...

Since the Sun is changing 4M tons of matter into energy every second and that energy eventually makes its way to the surface and is emitted as an outbound sphere of EM radiation, then the planets' orbits would change over time due to the less massive Sun at the solar system's core. It would...

I am having a very hard time understanding this concept in physics. Why would something orbit an object? Why doesn't it leave the orbit and move straight? Also when a satellite leaves Earth how does it go into orbit? Does it have to be launched at a specific angle.

Homework Statement What is the radius of a circular orbit about the Earth where the acceleration is 0.1g? Homework Equations g=9.8m/s^2 F=(Gmm)/r^2 Radius of Earth= 6.38x103 km Mass of Earth= 5.98x10^24 m/s The Attempt at a Solution I said 1/(2^x)=1/10 then did log2(10)=x and solved...