Orbital Definition and 820 Threads

The Earth has an orbit of radius 148 million km around the sun. What is the speed of the Earth on this orbit? dont know how to do it i have used a couple of different formulas and haven't gotten it right can anyone help?

I'm just curious as to why, when an orbiting body loses velocity (slows down) it's orbit must become more shallow, or smaller. I know this can be explained logically, but I would appreciate if someone could prove mathematically that it should happen. Thanks.

somebody help me start this question The asteroid belt circles the sun between the orbits of Mars and Jupiter. One asteroid has a period of 5 Earth years. What is the asteroid's orbital radius and speed? Thanks!

Can there exist a satellite which shares orbital foci with our Sun, and with the extrasolar likes of (e. g.) the Oort cloud - but in particular another star, say Proxima Centuri?

Show that the escape speed from a planet is related to the speed of a circulat orbit just above the surface of the planet by Ve = square root(2Vc), where Vc is the speed of an object in the circular orbit. I'm looking at GMem(object)/r^2 = m(o)v^2/r But I do not know if this equation will...

When looking at the orbital names, why does the fourth period of elements go 4s, 3d, 4p? Why is it 3d? Why not 4d?

Is anyone familiar with "Satellite Orbits: Models, Methods, Applications" by Montenbruck and Gill? I'm looking for something that starts a little more basic, but builds up to a decent level. I have my own copy of Vallado's Fundamentals of Astrodynamics and Applications, but it's a little...

http://www.medphys.ucl.ac.uk/~martins/orbit/orbit.html One of the best programs for anyone interested in orbital mechanics of space flight or anyone who just wants to simulate a shuttle or Apollo flight with a joystick. :smile: I found this a couple of days ago and have downloaded about...

When an electron is orbiting a proton, why is it not compelled to be attracted to the proton? Why doesn't it stick to the proton?

Th eother day while surfing I found a list of the 120 detected extra-solar planets. (Minus the 2 super giants) Just for the heck of it I decided to take this info and plot to a graph. I decided to plot planet mass against oribtal distance. The graph is attached. I also plotted the...

I am a first-year physics/chemistry major in First-term Calculus-based Physics. Normally, I have no trouble with my physics assignments, but this problem...man, i have no idea even where to start, even after analyzing it for two hours straight! Any help would be appreciated! 5. You are an...

Can we discern any movement by the microwave background perpendicular to its expansion?

What would the value of linear momentum in the r direction for an electron in the 1s orbital of Hydrogen be? Is this an expectation value or eigenvalue?

A comet is first observed at a distance of 1/3 AU from the Sun and traveling at a speed of twice the Earth' s orbital speed. Assuming that the Earth' s orbit is circular, argue from an energy viewpoint whether the comet' s orbit is elliptic, parabolic or hyperbolic. Now, I know the...

I have produced the most accurate electron binding energy equation known to-date. This equation predicts the ls orbital electron binding energies from lithium to uranium to within an accuracy of +/- 5%. The averaged error for all the ls orbital binding energies from lithium to uranium is only...

I am wondering what forces cause the nodes between orbitals to occur, and if these nodes are ever penetrated or crossed by electrons during exitation of the atom.

Have you guys heard of this: http://www.sciam.com/article.cfm?chanID=sa006&colID=5&articleID=0001A73A-45BC-1F7F-82D883414B7F0000

Greetings ! What do you think of the Orbital Space Plane program ? http://www.spaceref.com/news/viewnews.html?id=870 http://www.spacedaily.com/news/rlv-03a.html I realize the articles already express opinions on the subject so you can search other sources for more info of course. But...

Does anyone know what would be the approximate orbital period (time for one complete orbit) for an apple placed in orbit around Earth at the moon’s distance from Earth?

hi, could someone please help me with this problem?? If a small planet were discovered with a distance from the sun eight times that of the Earth, what would you predict for its period in (Earth) years. (i.e. how many times longer would it take to go round the sun than the Earth does.)