1. J

    The Orbit Of Pluto

    Hi all I need help with a physics question that has stumped me and I would really love to understand the problem and be able to do it but I'm getting nowhere. I have to reproduce the answers to the question below in Mathematica which is not my problem. My problem is I do not know how to...
  2. C

    What is the period of the binary orbit?

    Okay, here is the problem I'm trying to solve: There are 2 masses, one with 90% the mass of earth and one with 50% the mass of earth. Let's call the bigger one m1 and the smaller one m2. m1 has a radius of 95% that of earth and m2 has a radius of 40% that of earth. These 2 masses are in a...
  3. D

    Spacecraft Verticle Re-entry From A Geostationary Orbit

    Hi, I have a question, and I hope it's in the right place. If not, hopefully the mods won't mind too much moving it.... I have a basic understanding of the concept of a space elevator, where a line is tethered to the Earth at one end and "floating" in space at the other (presumably at a...
  4. W

    Mercury's Orbit

    I have been trying to understand Mercury's orbit and find statements to the effect that its orbit can't be defined by a single equation. If it isn't an ellipse, then what is it?
  5. K

    Explorer 1 Orbit

    Exercise taken from Caiken, pg 23 For part (a) I get (350+2549+2*6378)/2 = 7287.5 km for part (b) ... Used formula for conic sections \frac{p}{r} = 1 + e \cos \theta assumed perigee when \cos \theta = 0 and apogee when cos \theta = 1. This gives two linear equations: p/(360+6378) - e = 1...
  6. S

    What is the formula to find distance between two satellites in space?

    I want to write program to find the distance between two artificial satellites in space every 't' seconds. My initial inputs are initial velocity, masses , radii, position(x,y coordinates) of both the satellites. Then using Pythagoras theorem I can find the initial distance between the 2...
  7. B

    Rutherford model and the planetary sistem

    I cant understand how the Rutherford model would explain changes in the radium of electron orbits. Here is what I think: Moment 1 - An electron suffers an atraction force that is balanced with his kinectic energy, so he stays in orbit. Moment 2 - The electron looses energy and the orbit radium...
  8. S

    Tracking the Precession of Mercury's Orbit

    I didn't exactly know where to put this one, since it involves mechanics, circular motion, and General Relativity. To start off, I have to create a series of differential equations of motion to describe Mercury's orbit, then come up with another series to describe the effects another planet has...
  9. K

    Electron orbit

    What kind of motion does electron have as it "orbits" a nucleus? I have heard its not a classical orbit as that would mean the electron would radiate energy as it spiraled into the nucleus. Does that mean it "jumps erratically" around the nucleus?
  10. N

    Moon orbit

    Why does the Moon stay in its orbit without either leaving or approaching the Earth (more than it does)? Naturally, there is gravity and centrifugal forces counteracting one another, but why the balance? A man-made satellite may need occasional speed adjustment. Is there a balancing force...
  11. J

    The satellite in Earth orbit

    I would greatly appreciate any help on this problem! A satellite is in low earth orbit, but for one reason or another, its orbit is decaying. This means the satellite is losing altitude. Assume the orbit is circular. (radius of earth = 6400km, mass of earth = 6e24kg). 1) The...
  12. D

    RAAN for a sun synchronous orbit?

    Hey, was wondering if anyone here could help me untangle my confusion. I have this lab exercise which among other things requires an orbital analysis for a satellite. Specifically it's a sun synchronous orbit (97 degrees inclination, 393km height). What I'm a bit uncertain of is how to decide...
  13. Spruce

    Clock watching in orbit

    When an accelerating astronaut is in very close orbit around a stationary observer the astronaut will see the observer's clock run fast. From this fact, I conclude the astronaut will see any light sent from the observer as blue-shifted. From the observer's view, everything is reversed i.e. the...
  14. A

    Effect of radial and transverse forces on an orbit

    Hi, I have an object initially in a circular orbit and there are two additional forces on it; one radially outwards and the other in the opposite direction to the motion. How can I calculate how these forces influence the semimajor axis of the orbit? I have already tried working out how the...
  15. C

    A circular orbit.

    Hi, I was wondering if I had done the following question correctly, my answers do not seem very realistic at all and I am unsure about some of the assumptions I have made, any feedback would be welcome. The International Space Station (ISS) moves around the Earth on a circular orbit at a...
  16. V

    Elliptical Orbit Problem

    1. The problem statement, all variables and given/known data A satellite of mass m is in an elliptical orbit around the Earth, which has mass M and radius R. The orbit varies from closest approach of 'a' at point A to maximum distance of 'b' from the center of Earth at point B. At point a the...