All Questions
87
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38
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Does anyone know where I can find values of gravity?
Does anyone know where I can find the values of gravity at different places across the globe and at different heights? I am doing an assessment on gravity and can't find any data for the values of ...
1
vote
0
answers
41
views
Atmospheres and oceans on lower gravity planets
Using Earth as an example, how much less gravity could the planet exert and still retain its atmosphere and oceans? Or is it a matter of size, mass, magnetosphere, place in the solar system, all of ...
- 111
0
votes
2
answers
501
views
Do magnetic things fall faster?
Assuming correct orientation, do magnetic things fall faster than non-magnetic ones because of the magnetic field of the Earth? Of course it is clear that if any, the effect is very very small, but ...
- 101
0
votes
2
answers
171
views
Would a body have any residual velocity if launched at escape velocity from the Earth's surface?
A body is lanuched at escape velocity from the Earth's surface i.e 11.2 km/s ,what would be it's velocity outside the Earth's gravitational field?
I guess it would be zero but there's another problem ...
- 41
1
vote
1
answer
177
views
Can centrifugal force inside Earth's outer core overcome gravity?
As the gravitational field inside Earth outer core is relatively weak can the angular momentum of Earth's outer core be high enough to cause lighter elements or compounds being deposited in Earth's ...
- 2,255
8
votes
7
answers
10k
views
Why doesn't Einstein's general theory of relativity seem to work on Earth?
I am new to physics and I have learned a little bit about gravity from Einstein's perspective. The gist is that heavy objects create curvature of spacetime, and free-falling objects move on the ...
- 253
0
votes
3
answers
123
views
Is it possible for meteors and asteriods to become natural satellites of Earth?
We know that the moon isn't falling on the earth because it's in orbit. If we make an asteriod or meteor spin is it possible for it to become a natural satellite of Earth?
- 555
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votes
0
answers
73
views
Is Earth flat according to Einstein? [duplicate]
I didnt understand how to apply general relativity to Earth. If there is no such a thing as gravity but spacetime bending. Can someone just show, send something to read how gravity works in Earth ...
- 11
-1
votes
1
answer
178
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Gravitational field of sun [closed]
Let there be a solar system without Earth.
Now what happen if we place the Earth suddenly on its actual position does the gravitational force of sun acts on it immediately because of its pre ...
- 335
0
votes
2
answers
530
views
In the tunnel through the Earth thought experiment, how does total energy of a particle vary when it goes from surface of the Earth to its center?
In the typical tunnel through the center of the Earth thought experiment, a particle at the surface would oscillate between the two diametrically opposite points ignoring the rotation of the Earth. ...
- 3
0
votes
1
answer
690
views
What would happen to the water bodies if gravity ceased to exist on Earth?
If water stopped flowing (it would stop flowing downwards from mountains and all)
then, would it start rising upwards? If it floats on the space ( I say space because there'd not be any atmosphere) ...
- 465
0
votes
0
answers
44
views
Large objects in the universe sized by gravitational and electrical constants
In a famous talk (from 14:30 to 15:00) Nima Arkani-Hamed tells us that what "fixes the size of the earth" is the equilibrium between the gravitational pressure against the atomic pressure of the atoms ...
- 406
5
votes
1
answer
97
views
Is the Earth orbiting an 'illusory' Sun, owing to the 'speed' of gravity? [duplicate]
We see the Sun about eight minutes after light left it. Presumably this means we are also experiencing the Sun's gravity 8 minutes after it 'left' the Sun.
So are we orbiting around the Sun we can ...
- 3,006
-1
votes
2
answers
69
views
Sun-path on the sky [duplicate]
We are standing on the Earth and we see Sun on the sky. We see it walking in a certain direction, with predictable moving. Earth is a spheroid, as we all know. It is circling around the Sun, and also ...
- 119
0
votes
1
answer
129
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How does gravity change nearing the core in free fall? [duplicate]
The Pole to Pole Mole Hole-
If there were to somehow be a cylinder going from the North to South Poles, all the way through Earth, then what would happen halfway down (The Core). If something fell ...
