Orbit Definition and 1000 Threads

Homework Statement A 2580-kg spacecraft is in a circular orbit a distance 1580km above the surface of Mars. How much work must the spacecraft engines perform to move the spacecraft to a circular orbit that is 4190km above the surface?Homework Equations \DeltaU=GMsMm(1/r_2-1/r_1)...

Homework Statement (a) What is the minimum speed, relative to the Sun, necessary for a spacecraft to escape the solar system if it starts at the Earth's orbit? Homework Equations Kinetic Energy=Potential Energy 0.5mv^2=rGM/(r^2) 0.5v^2=GM/r Where M is the mass of the sun, and r is the...

Hi guys! I am really involved in a scientific project. I have to put in orbit an object. I was wondering what formulas I could use..? I know pretty well kepler's laws, which are very helpful, but I don't know how to put in orbit an object... ? I can easily calculate its tangential velocity and...

This is obviously a highly complex question, but I'm really interested in it, and I still don't know where to start after looking around a while. If you had an object that was .019 kilograms, how fast and at what angle would you have to shoot the object at to get it to orbit at 200000 meters...

Homework Statement Find eccentricity for: a comet with mass 1.2x1010kg moves in an elliptical orbit around the sun. Its distance from the Sun ranges between .5AU and 50 AU. Homework Equations The Attempt at a Solution I drew it out to try and viualize it and i know eccentricity...

Problems with an Orbit... Homework Statement what is peculiar about the orbit" Semimajor axis = 5740km Eccentricity = 0.1 Inclination = 53 Right ascension of the ascending node = 345 Argument of perigee = 270 True anomaly = 183 Homework Equations The Attempt at a Solution...

Homework Statement A. Suppose you are at the Earth's equator and observe a satellite passing directly overhead and moving from west to east in the sky. Exactly 15.0 hours later, you again observe this satellite to be directly overhead. How far above the Earth's surface is the satellite's...

Homework Statement Suppose a spacecraft of speed v_c is in a circular orbit around the Earth at a height H from the surface of the earth. The rocket motor is fired in the opposite direction of motion to reduce the satellite's speed to v_0 and make the orbit elliptical. Let R denote the...

I am kind of new to astronomy and I have a few questions.. I need to be able to determine an equation expressing the elliptical orbit of Oberon around Uranus. I have four nights of data showing Oberon in different positions relative to Uranus. I am able to calculate the RA and Dec for both...

Homework Statement Use the information in Section A.3 and the data in Table A.19 to calculate the heliocentric radial distance (in AU) of Comet Halley at 12h UT on July 16, 1994. - Done, Section A.3 just talked about finding dates using Epochs and such. Table 19 had comet details which will...

Homework Statement Given: G = 6.67259 × 10−11 Nm2/kg2 The acceleration of gravity on the surface of a planet of radius R = 4190 km is 6.5 m/s2. What is the period T of a satellite in circu- lar orbit h = 14120.3 km above the surface? Answer in units of s. Homework Equations...

We stay in orbit around the sun? Our own planet's kinetic energy keeps it from succumbing to the Sun's gravity, same concept with the electrons, this time Gravity being electromagnetic force right? Edit: Damnit, wrong section...

First post, I am just a layman, so go easy. The way I understand it, the moon is following a straight line through space. However, the mass of the Earth is so great that it warps the fabric of spacetime and it appears that the moon is going around the earth. Same with any moon or planet, they...

Why Earth's orbit is elliptical rather than being perfectly circular

If G is a permutation group acting on a finite set A and x \inA, then |G| = |\Delta(x)| |Gx| where \Delta(x) denotes the orbit containing x. I'm having some difficulty understanding this theorem. For example, Consider the following set G of permutations of the set M = {1,2,3,4}...

"simple" 3d orbit question Hi folks, I am following this pattern: http://www.bit-101.com/tutorials/3D-rotation.html to build a 3d model of an atom, using silverlight. I have what i think is an easy question for math pros... I'd like to know what I can change to make the angle of the...

Is the Moon’s orbit more or less elliptical than the Earth’s? How does this affect the range of angular sizes for the Moon vs. the Sun? I always thought smaller objects are less elliptical than larger objets, so the moon would be less elliptical Can someone clarify? Thanks!

Of course Earth's orbit is not circular, but Is Earth’s orbit far from circular? Thanks

In certain cases, using both the momentum principle and energy principle to analyze a system is useful, as they each can reveal different information. You will use the both momentum principle and the energy principle in this problem. A satellite of mass 4000 kg orbits the Earth in a circular...

Homework Statement A 62kg satellite orbits the Earth with a radius of 3.3*10^7 m. A net external force acts on the satellite to an orbit of 7.7*10^6 m, what work must the external force do? Homework Equations W = integral of F with respect to d The Attempt at a Solution Integrate...

How do you calculate the distance above the surface of the Earth to geosynchronous orbit.

Homework Statement If the eccentricity of a planet's orbit about the sun is 0.4, find (a) the ratio of the lengths of the major to minor axes of the planet's orbit, and (b) the ratio of the speeds of the planet when it is at the ends of the major axis of its elliptical orbit. Homework...

I'm having some trouble understanding this (not a homework question by the way.) A satellite orbits the Earth with a certain angular velocity. Centripetal acceleration is directed radially inward. Acceleration due to gravity of the Earth is also directed radially inward. If I draw a free body...

Homework Statement The weight of a satellite in a circular orbit round the Earth is half of its weight on the surface of the Earth. If the mass of the satellite is 800kg, determine (i)the altitude of the satellite (ii)the speed of the satellite in the orbit (iii)the minimum energy required...

Homework Statement given that T(sun)=5771.4, S(Earth)=1370, D(Earth)=1.5x10^8km, R(sun)=7x10^5km calculate the radiance of solar radiation at Earth orbit Homework Equations Irradiance=Radiance/Solid Angle Solid Angle=Area/Distance^2 I=sigma*T^4 The Attempt at a Solution...

Note: This isn't a HW question. I have learned that the magnitude of charge of a proton and electron is the same (i.e. 1.602 * 10^19 Columbs). Then why does an electron need to move in an orbit because the charges could cancel each other out and the electron could remain stationary. I...

Hello everyone! Please, help me understand the following problem: Homework Statement Earth's orbit around the Sun is nearly circular. The period is 1 yr = 365.25 d. (a) In an elapsed time of 5 d, what is Earth's angular displacement? Solved! (b) What is the change in Earth's velocity, Δv...

Homework Statement The problem is that a satellite is ejected from a planet radius R and mass M, that has no atmosphere, 30 degrees from vertial with velocity vo. This is a multi part problem dealing with center of mass/inertia, the part I need help with is the following: 1. When the...

I have a problem where it ask to find the period/time(using Kepler's 3rd law) of an unpowered spacecraft to move from Earth's orbit to Mars orbit using the transfer orbit approach. I found P/T using kepler's 3rd law but the second part ask to find how fast the spacecraft need to be moving at...

I'm toying with the idea of making a little 2D space orbiter game so I've implemented Newton's universal gravity law into this little app. It works really well, even. The problem I'm having is when I want to create an asteroid-belt. I spawn little asteroids randomly around an area around the...

I am studying for a modterm on Monday and asking for help on the homework questions I got WRONG on my problem sets (so I can hopefully improve my understanding and see my mistake). This is my reworked version of the incorrect HW problem and I would like to know if I am on the right track...

Hello, I'm doing a project on proving the existence of black holes. I am using Sgr-A as a test subject and am after the data set for the orbit of the star S2 around it so I can do some of my own calculations on it. Does anyone know where i might be able to obtain these?

Hello, I'll take you've heard of the heat death of the universe. Now I was wondering: will electrons actually, at some point, leave their atom? If so, is this solely due to the fact that the quantum mechanical chance of an electron being out of an atom is not zero and thus, according to...

A.) Assume a rectangular coord system has its origin at the center of an elliptical planetary orbit and that the coord system x-axis lies along the major axis of the ellipse. Show that the equation for the ellipse is given by x^2/a^2 + y^2/b^2 =1. where a and b are the lengths if the...

Hi Everyone! I'm new here and like this forum. Can anyone tell me how the electron moving roundly in atom doesn't emit EM waves while changing it's speed?

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Hy. What makes the planets to keep their position on the orbit (the same orbit). Shouldn't be attracted by the gravitation of the star ? Thanks!

Homework Statement The solar system is situated 26,000 light years from the centre of our galaxy, the Milky Way, and it orbits the centre at a speed of 220 km/sec. Calculate the time required in millions of years for one orbit. (NOTE: The circumference of a circle = 2 pi r where r is...

Homework Statement If someone told you that astronauts are weightless in orbit because they are beyond the pull of gravity, would you accept this statement? Explain. Homework Equations The Attempt at a Solution I say no. There is still gravity, but its just weaker with distance...

Good morning, I have a doubt about the differentiation of the polar equation of an orbit: r=\frac{p}{1+e\cos\nu} It represents the relative position of a planet with respect to the central body. Here, p is the parameter, e is the eccentricity and r is the radius of the planet measured from...

A satellite is in an unstable elliptical orbit around the earth. Is there a way of tracking each satellite's orbit till it reaches the critical stage then follows it's reentry path? V<Vescape r=a*(1-e^2)/(1+e*cos(True Anomaly)) Book recommendations welcome. College educated.

Hello, I was just curious why do all of the planets in the solar system orbit in approximately the same plane? Why is it not random? This is not a homework question, but if possible I would like to see the math that accompanies the explanation. thanks

simple question - can someone please clarify the difference between these two orbits? i recall arthur c clarke's original concept for communication satellites in what i believe he called geosynchronous orbit such that the satellite(s) would remain over a single fixed point on Earth's surface...

What does most evidence point to regarding the reasons for Sedna's looong orbit? I think it highly unlikely that the Sun's gravitation can keep it in place.

Homework Statement Does the centripetal force equal the gravitational force? Homework Equations Fg = G(m1)(m2) / r^2 Fc = 4(pi^2)(m)(r) / T^2 The Attempt at a Solution I have the mass of a satellite in geosynchronous Earth orbit. The period of Earth's orbit, and the Earth's radius and...

what is the maximum number of electrons allowed in each of the first 5 orbits of an atomic particle? Is it the same for all elements? or do different ones hove a different maximum numver of electrons possible of being in an orbit?

http://img810.imageshack.us/img810/1883/planet.jpg Uploaded with ImageShack.us Homework Statement I have a body of mass m, which is moving in a circular path around some planet. At a certain instant, the object explodes into two equal bodies. I'm given that the tangential velocity doesn't...

I've got a pretty simple question, and it may sound dumb, but I'm going to ask it anyway: First, I'll preface by saying that from what I understand (and please verify or correct me), planetary orbit in a star system decays over time a la net force. I also have come to understand that the...

Hello, I’m glad that I found this forum, because there is a question that has been bothering me for some time, and maybe someone on a physics forum like this can set me straight on it. It concerns gravity and acceleration. I understand that when an object such as a space shuttle is...

To reach orbit you have to have your vehicle have a horizontal, i.e., tangential, orbital velocity, of about 7,800 m/s and have sufficient altitude, say at least 100 km, the altitude considered to be "space". To get to this altitude you have to have a separate velocity in the vertical direction...