All Questions
24
questions
0
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31
views
Better equations for modeling and simulating a halo orbit?
I'm trying to model a halo orbit at low altitude (10m from surface). The satellite is using propulsion to trace the circular halo path. It looks like this "from the top" (the blue ball is ...
- 231
1
vote
3
answers
140
views
Do objects with non-uniform shapes and mass distributions rotate as a result of gravitational attraction?
I was thinking about orbital mechanics this morning and a question arose: do objects with non-uniform shapes and mass distributions rotate as a result of gravitational attraction?
Thinking through the ...
- 822
0
votes
3
answers
74
views
How velocity affects different orbits?
Assume a sun with mass $M$ and a planet with mass $m$. Assume at $t_0$ the planet is $r_0$ (distance) away from sun and has an initial velocity of $v_0$. Also, let’s assume the angle between the $r_0$ ...
- 117
0
votes
2
answers
611
views
Increasing the speed of satellite to raise an orbit
Suppose we have a satellite orbiting the Earth in an elliptical-closed orbit. When the satellite reaches the perigee, its velocity is increased in the cross-radial direction. According to all the ...
- 1,791
-1
votes
1
answer
92
views
Why Moon is not falling on Sun (Hill's sphere)?
The Hill's radius of Earth in Earth-Moon system calculated by formula https://en.wikipedia.org/wiki/Hill_sphere is 58212 km
But the distance between Moon and Earth is 384,400 km
So, why Moon is not ...
- 768
8
votes
3
answers
746
views
Regarding distance laws of gravity from “A Brief History of Time” and why the Earth doesn't fall into the Sun
In “A Brief History of Time”, Hawking explains Newtonian gravity in Chapter 2, Space and Time. The further apart the bodies are, the smaller the force. The gravitational attraction of a star is ...
- 183
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votes
1
answer
133
views
Does Newton's Theory with Retarded potentials give rise to the motion of perihelion of Planets
If we take into account the retarded potentials and the motion of the Sun(due to the planet), does Newton's Gravitational theory give rise to the motion of Perihelion of planets (qualitatively, not ...
user300251
1
vote
1
answer
58
views
Justification for the nature of planet's orbit in gravitational field!
In kleppner Mechanics in the chapter central force he derived the polar form of orbit for gravitational force as illustrated below: (first two equations are derived from fundamentals of central force)
...
0
votes
1
answer
32
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What are the Gravitational PE conventions for setting the zero point at infinity?
If you set the zero point at infinity (the edge of the universe), is the gravitational PE still zero at a distance $\infty \pm r$? Or would you make it a $0 \pm (-Gm_1 m_2/r)$? Basically, is infinity ...
- 65
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votes
3
answers
2k
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How does the Earth's orbit change as the Sun decreases in mass?
When the sun transitions into it's red giant phase it's mass is said to decrease (An article I read quoted it to go down to 67% of its mass however the number is not important). Since the orbital ...
0
votes
1
answer
296
views
Path of an object in gravitational field [duplicate]
How do you prove that path of a satellite or a planet is a second degree curve? In other words, how do you prove Kepler's law which states that planets move in elliptical paths?
-2
votes
1
answer
193
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Is it possible that regular asteroids striking force (radially inward) could explain the remaining 43 arcsecs/century discrepancy? [closed]
Newton's gravity equations give 5557 arc-sec/century Mercury perihelion advancement Vs 5600 arcsec/century actual observed. is it possible that regular asteroids striking force(radially inward due to ...
2
votes
1
answer
366
views
First integral of the Kepler problem
Consider the motions of a bounded particle which is under the influence of the
gravitional interaction of a second particle fixed at the origin
$$
\ddot q = -\nabla V(q)
$$
where $V(q) = - \frac{\mu}...
- 165
0
votes
1
answer
2k
views
Why do the satellites revolves on a circular path around a planet at orbital velocity? [duplicate]
We know that there is a particular velocity with which a satellite will move in a circular orbit ( orbital velocity ) but if its velocity is more than the orbital velocity but less than the escape ...
- 282
0
votes
3
answers
841
views
Angular momentum
The satellites are revolving around a planet in circular orbits by themselves (no external source to maintain their speed). Are we able to make them revolve in elliptical orbits by themselves?
Do ...
- 908