All Questions
Tagged with earth orbital-motion
16
questions
89
votes
9
answers
220k
views
Why doesn't the Moon fall onto the Earth?
Why doesn't the Moon fall onto the Earth? For that matter, why doesn't anything rotating a larger body ever fall onto the larger body?
- 1,033
39
votes
7
answers
14k
views
Why don't we feel the subtle speed change of Earth's elliptical orbit?
Earth's orbit is a slight ellipse, so to conserve momentum its speed increases when it is closest to the Sun. If the speed changes there is an acceleration. If there is an acceleration there is a ...
- 2,878
5
votes
2
answers
1k
views
Deviation from Earth's orbit
How much orbital deviation is required for the Earth to get knocked out from current orbit so it either moves away from Sun or towards the Sun?
- 872
28
votes
5
answers
11k
views
Build a ring around Earth, then remove the supports
What would happen if we decided to build a giant ring that managed to wrap around the whole world, end to end that was supported with pillars all along the ring and then the supports all suddenly ...
- 429
3
votes
4
answers
510
views
Should the centripetal force of Earth's orbit around the Sun affect a pendulum on Earth?
Lets use approximate earth angular velocity around the sun with $\omega\approx2*10^{-7}\frac{r}{s}$ and earth translation orbit radius with $r\approx1.5*10^{11}m$ we can approximate centripetal ...
- 33
2
votes
1
answer
3k
views
Why doesn't the moon crash into the Earth? [duplicate]
I was searching about 'why do not moon crash to earth due to its gravity?'Then by reading physics stake exchange existing questions I came to know that its the sideways motion of the moon that keeps ...
15
votes
1
answer
2k
views
Mars just collided with Earth! A question of eccentricity
One of the standard theories behind the formation of our Moon is the giant impact hypothesis, according to which Earth was struck by a Mars-sized body (about $10\%$ the mass of Earth) early in its ...
user10851
10
votes
3
answers
4k
views
How is it that the Earth's atmosphere is not “blown away”?
The Earth moves at a high rate of speed around the Sun, and the solar system is moving quickly around the Milky Way. How is it that the Earth's atmosphere is not “blown away”?
- 109
5
votes
1
answer
471
views
Could the Earth be ejected when the sun burns out?
My younger brother came home from school today and told us at the dinner table that when the sun burns out the Earth could be ejected from its orbit. Skeptical, I asked his source. He quoted his ...
- 184
5
votes
1
answer
4k
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Duration of Satellite orbit in the shadow of the Earth
I want to determine how many minutes a satellite is in a circular orbit around the Earth at about $1000 km$ altitude. I assumed that the Sun-Earth vector lies exactly in the orbital plane of the ...
- 65
5
votes
4
answers
8k
views
Could we make a trebuchet that could launch objects to a stable orbit?
Inspired by this xkcd, which calculated the energy requirements for accelerating individual humans to escape velocity (regardless of consideration for what that would do to your organs), I am ...
- 3,241
4
votes
2
answers
3k
views
How does Earth carry Moon with it, if it can not force Moon to touch it by gravitational force?
Earth's gravitational force is acting on its Moon in such a way that it forces the Moon to rotate round its orbit by centripetal force and carries it while rotating round the Sun by gravitational ...
- 143
3
votes
2
answers
835
views
Is it better to build a space elevator from GEO down to the surface of the Earth?
Having just finished Arthur C. Clarke's "The Fountains of Paradise", Clarke seems to make a distinction between starting construction of a space elevator from geosynchronous orbit and working on our ...
- 504
0
votes
4
answers
1k
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Why is Earth rotating along $x$(day and night) and $y$(tilt, causing seasons) axis, but not along the $z$ axis (taking $z$ as the axis along orbital)?
I have read this:
http://en.wikipedia.org/wiki/Axial_tilt
It is obvious that the rotation of any planet is a combination of rotation along three axis x,y,z.
Lets take the z axis as the one being the ...
- 29k
0
votes
2
answers
394
views
What is Earth's linear velocity around the Sun?
I am creating a theoretical model of the Earth's tangential acceleration around the Sun (on an elliptical orbit, not circular). First, I will build a theoretical model, which is not influenced by any ...
- 115