All Questions
16
questions
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62
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Has our knowledge of astrophysics and gravity reached the point where we can accurately calculate Lagrange points?
is it possible for us today given the knowledge we possess of gravity and our success with inserting satellites in to steady/ geosynchronous orbit and any knowledge we have on the relative size (and ...
- 107
0
votes
0
answers
25
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How does moving the pericenter affect the apocenter?
A perfectly circular orbit of a constant height (distance from the center of mass of the orbited planet) around a perfectly spherical planet with smooth surface and no gravitational anomalies will ...
0
votes
1
answer
78
views
Can I please get the proofs for different trajectories of a satellite when projected at different velocities? [duplicate]
I recently came across a question about the trajectories of satellites, I have tried many resources for the proofs but couldn't find them.
For example, a satellite will have an elliptical orbit if (...
- 21
0
votes
0
answers
36
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3-body problem: Is it possible to find real moon orbit if I know kepler's orbit elements for 2body, direction to planet and real gravity force vector?
I have a system of Sun, planet and moon of planet. I can find orbit of moon using kepler's law. But distance between planet and moon is a half of distance between planet and sun.
So, if I will ...
- 768
4
votes
4
answers
652
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Calculation of the speed of the ISS from the circulation time
This is my first question, and as a chemist, my physics vocabulary is a bit limited. A younger friend of mine asked me about a physics question from school, but I am not able to solve it, and I think ...
- 149
0
votes
1
answer
78
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Confusion on Gravitation/Orbital Mechanics
In polar coordinates, we can write:
$$\frac{d^2\vec{r}}{dt^2}=\frac{-GM}{r^2}\hat{r}=(2\dot{r}\dot{\theta}+r\ddot{\theta})\hat{\theta}+(\ddot{r}-r\dot{\theta}^2)\hat{r}$$
$$\frac{-GM}{r^2}=\ddot{r}-r\...
- 41
0
votes
1
answer
41
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Satellite path dependence on velocity
How does a satellite planetary path depend on its speed and other factors.
I want to know more about parabolic, elliptic and hyperbolic paths of satellite.
- 1
0
votes
1
answer
331
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Why does a satellite moving around earth in circular motion its speed is constant?
I do know the satellite's tangential velocity is always perpendicular to gravity, therefore its speed must remain unchanged, however, I have some confusion.
If I separate both the tangential velocity ...
- 37
0
votes
1
answer
734
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How to decrease satellite's orbital radius?
According to the equation $v²=GM/r$ to decrease the orbital radius of a satellite currently in orbit, you'd want to increase its speed. However intuitively this doesn't make sense to me, surely if you ...
0
votes
1
answer
60
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Satellites orbiting around any planet's [closed]
Suppose a satellite is revolving around a planet with radius r. Now if we increase the value of r then the angular velocity and kinetic energy will decrease, but the total energy & potential ...
- 21
7
votes
5
answers
2k
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Kepler's 3rd law: ratios don't fit data
I have been looking at satellite orbits around the earth, or any object around any planet in fact, and am trying to find the orbital radius, or semi major length of a given satellite.
Kepler's third ...
- 173
0
votes
1
answer
296
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Can there be an orbit beyond the Geostationary orbit?
I am interested in knowing if we can place a satellite beyond the geostationary orbit. I know that we can send objects beyond that, but can a normal satellite do all its functionalities in that case?
- 443
0
votes
2
answers
236
views
Throwing a stone from satellite toward a planet
If I'm in a satellite which is moving in circular orbit of radius $r$ around a planet which has no atmosphere, means no air friction. And if I throw a stone from satellite toward planet then it's ...
- 27
1
vote
0
answers
32
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Can a satellite be put into orbit such that it will always remain directly over a city? [duplicate]
Isn't it possible if we just set it high enough so that it's angular speed matches with the earth's?
I think that the city must be on the equator to make this happen. Am I correct?
Please can anyone ...
- 913
5
votes
2
answers
331
views
Is tripleaxis planet possible?
Imagine. Our solar system. Our sun. Then earth and moon orbiting it. And you have "powers" to create any planet you want, any size, any density, any weight and any velocity. Would it be possible for ...
- 155