All Questions
Tagged with earth orbital-motion
104
questions
-3
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1
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2k
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Why don't Moon collide with Earth but revolves due to gravity? [duplicate]
As we know gravitational force is a central force so due to gravitational effect they must collide with each other but why they revolve?
2
votes
1
answer
413
views
The speed of throwing an object horizontally such that it is in orbit around the Earth [closed]
The question is given that for every 3,570 meters you walk , the Earth curves downward by 1 meter.
The time it takes an object to fall from a height h is
t = sqrt(2h/g), where t is in seconds, h is ...
- 37
3
votes
2
answers
58
views
How long do you have to wait outside of the orbit of the Earth for desired location to be right below?
My father had a (very theoretical) idea of a transportation system, where shuttle would be shot directly up from the Earth, it would stay still in the space for so long that the destination would be ...
- 131
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
12
votes
4
answers
3k
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If we were on the Moon would Earth appear to be in motion or at rest?
If we were on the moon would earth appear stationary or would it appear to move. I think it must be stationary because moon is in sychronous rotation with earth.
- 644
-3
votes
1
answer
107
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Circumference of the earth [closed]
Is it possible to calculate the circumference of the Earth if you are given only the circumference of the Earth's orbit? If so then please explain.
- 15
1
vote
1
answer
98
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What is the minimum possible size for an asteroid to be able to alter Earth's orbit? [closed]
Obviously, the question as posed in the title is very incomplete. Allow me to rephrase it in more specific terms:
What are the minimum possible "combined parameters" (velocity, mass, angle of ...
3
votes
1
answer
651
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Is moon in perfect tidal lock with earth?
Moon appears to be facing its same side to earth throughout its orbit around earth.
This is said to be because of tidal locking , i.e. the moon rotates at the same rate as it revolves around the ...
- 838
-4
votes
4
answers
278
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Is Earth continuously changing its orbit size i.e, circumference of the orbit? [closed]
One year have 365 days, but in leap year we have 366 days.
Does that mean earth is continuously change its orbit size for every four years.
like . 365.0 -- 365.1 -- 365.2 -- 365.3 -- 365.4 -- 365.5 -- ...
- 133
39
votes
7
answers
14k
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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
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3
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Why doesn't the earth collide with the sun in 64 years?
According to another answer on this site, the time it takes for two bodies in space to collide can be computed with the following formula:
$$\frac{\pi}{2\sqrt{2}}\frac{r_0^{3/2}}{\sqrt{G(M+m)}}$$
...
- 4,494
0
votes
2
answers
326
views
Why can't we detect the Earth's orbital motion when looking at the sky and stars?
After I read that speed of earth orbit around the sun is 30 km/s, I looked at sky and I didn't notice any change when compared to the start location.
30 km/s can be converted to (30 * 60 ) km/minute =...
- 113
1
vote
3
answers
329
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Would a non-rotating Earth collapse on the Sun?
If the earth stopped rotating on its axis, would this influence its revolution motion? In particular, could it collapse on the sun? I ask this because on the one hand I thought the two degrees of ...
- 1,793
4
votes
2
answers
254
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Why is there ice at the Earth's poles? [duplicate]
I beg your pardon for such a silly question, but I've never really understood the explanation they gave in the Geography textbooks. If the slanting Sun's rays due to the Earth's axial tilt can cause ...
- 359
15
votes
4
answers
10k
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Can the Earth leave orbit if the population of humans and other live forms increases?
I don't know a lot about physics, but this seemed like the correct place to ask my question. I apologize in advance if it is a ridiculous one.
It's actually a two part question:
If the population of ...
