Questions tagged [earth]
Earth is the planet on which we live, the 3rd planet from the Sun. Questions using this tag should be about Earth the planet and not Earth-like planets nor earth, as in dirt or soil.
1,113
questions
1
vote
1
answer
48
views
Why the density have anything to do with initiation of subduction?
No matter wherever I read the process of subduction, I always find this one sentence which says "when the two tectonic plates collide the denser plate gets subducted under the lighter plate ...
-1
votes
1
answer
55
views
How exactly did Harrison's chronometer circumvent the impulse problem of time-keeping on a moving ship?
According to folklore, around the time of the exploration of the New World, there was a quandary regarding how to measure time on the open sea. Time keeping then was based on the pendulum clock, which ...
- 179
6
votes
2
answers
289
views
Does life erode Earth's mass over time?
Since life converts matter to energy, and there's no natural process that does the opposite (aside from supernovas), does this mean that the mass of our planet is gradually diminishing? I asked ...
- 61
4
votes
1
answer
161
views
Would the Moon move away if the Earth were frozen with no liquid tide?
The moon is moving further from the Earth. To the extent that after 600 million years we will no longer enjoy full solar eclipses as it will be too far away to completely block the sun.
The reason the ...
- 141
-6
votes
1
answer
49
views
Why sun revolve around the sun ? Why cant it just rotate ? ( gravitas attraction force makes it revolve , how?) [closed]
Why the revolution ?
How General relativity theory explains it
0
votes
1
answer
21
views
Can we treat the entire mass of the spheroid as being concentrated at its center?
I know that to find the gravitational force between two objects, if either of them is a sphere, we can assume its mass to be concentrated at its center and use the formula for gravitational forces for ...
- 69
0
votes
1
answer
59
views
Would it be possible to build a device or structure that could absorb the impact of an asteroid?
This is probably a stupid question but as the title says would this be possible. I'm imagining some kind of large structure which absorbs the impact rather than deflects it and then, a step further ...
- 9
1
vote
2
answers
90
views
Why is Coriolis effect responsible for COUNTER-clockwise rotation in the northern hemisphere?
Based on the form of the force, $F_\text{cor} = - 2m\mathbf{w}\times\mathbf{\dot r},$ I would expect a projected particle to rotate clockwise in the northern hemisphere. This is confirmed by the ...
- 163
1
vote
0
answers
38
views
Electrostatics: Electric Potential of Earth [duplicate]
I have a very basic question which is: Why we consider the potential of Earth to be zero?
Generally in physics we consider the electric potential at infinity to be zero. But while reading about ...
- 64
0
votes
1
answer
24
views
How to calculate the latitude/longitude by the RPM in the basin? [duplicate]
By seeing how the water swirls and whirlpools when going down the drain in a washbasin is it possible to tell something about the longitude or latitude where the individual is?
- 1,379
0
votes
1
answer
43
views
How is falling into the Earth while orbiting it a geodesic?
So in regular Newtonian mechanics, orbits are generally stable so if there is a metal sphere orbiting the Earth assuming no tidal interactions, they should stay where they are.
But then gravitational ...
- 1,534
3
votes
3
answers
329
views
Comparison of clocks running at different heights in a gravitational field
I hope this question has not yet been asked. If so then please link me to the answer.
If I build an apparatus which, on flicking a switch, sends a light beam, a distance to a mirror, and reflects it ...
1
vote
3
answers
86
views
The speed of an impulse transmitted along a string
A supernova explosion on the far side of the Sun ejects a mass with approximately the same mass of the Sun directly at the back side of the Sun. If this ejected mass is travelling arbitrarily close to ...
2
votes
0
answers
35
views
Effect of rotation of earth on levitating objects [duplicate]
If a drone is designed, such that it applies a constant force equal to it's weight ($mg$) on air, to maintain a constant elevation (say of 10 meters). What will happen when considerable time has ...
- 367
3
votes
2
answers
429
views
Can the Dzhanibekov Effect celestial bodies, like Earth’s crust and/or core causing the flipping of magnetic poles?
“The tennis racket theorem or intermediate axis theorem, is a kinetic phenomenon of classical mechanics which describes the movement of a rigid body with three distinct principal moments of inertia. ...
- 151