All Questions
33
questions
-6
votes
1
answer
52
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
61
views
Clear explanation of acceleration of the earth
The Earth rotates with an angular velocity of $\omega$.
My questions:
Is the angular acceleration of the Earth equal to $0$ because angular velocity is stable?
What is the difference between angular ...
- 17
1
vote
0
answers
20
views
If the liquid internal parts of the Earth solidify, what will be the consequences?
Will the Earth's radius just decrease, the daytime decrease, and the magnetic field seize to exist?
2
votes
2
answers
127
views
Can we prove the Earth rotation with a disk mounted in its center on a frictionless axis?
Can somebody prove the rotation of Earth if it places an uniform disk with a hole in its the center on an axis and orient it paralelly to Sun ecliptical disk?Just assure himself that the disk on the ...
- 2,255
2
votes
1
answer
404
views
How big (in meters) could the difference be between ECI and ECEF coordinates at midnight UTC?
Is the only difference due to leap seconds, etc. or other differences between UTC and updated forms of universal time, such as UT1? In other words, are all earth-centered inertial (ECI) coordinate ...
- 145
2
votes
4
answers
2k
views
Change of direction of rotation with change of perspective
Take an apple. Rotate it around its vertical axis to the right (relative to you). If you look at it from above (your head above the apple) and take a point there while the apple is rotating, you will ...
- 97
3
votes
1
answer
1k
views
Will an object dropped from a high building displace due to the Earth's rotation?
I read that in the 16th and 17th century, the question of whether the Earth rotates around its axis or all celestial bodies rotate around it was extensively debated. One of the anti-rotation arguments ...
- 433
1
vote
1
answer
76
views
Earth rotation with atmosphere
Note: This might be a very dumb question
Considering Earth's rotation on its axis, I was thinking it made sense for the outer sides of the Earth to have a significantly higher tangential speed, ...
- 53
5
votes
2
answers
3k
views
Why doesn't Foucault's pendulum show Earth's spin at the equator but works at the North/South poles
If you where directly above the North/South pole and set up Foucault's pendulum, why does it show the Earth's spin even though the Earth isn't spinning there? This is also where it takes the shortest ...
- 359
-2
votes
2
answers
160
views
Day/Year Length Of Larger, but same mass, Earth? [closed]
I’m wondering how the length of a day and year would change on Earth if it was twice as big, but the same mass (less density)?
Also, would such a difference cause it to orbit closer or further from ...
- 107
0
votes
1
answer
345
views
Why is 24h (angle) equivalent to 360°?
Why is 24h (angle) equivalent to 360°? The earth does not spin 360° in 24h.
When giving astronomical coordinates, my GCSE study guide says right ascension is measured in hours where 24h right ...
- 331
40
votes
3
answers
10k
views
Why wouldn't the part of the Earth facing the Sun a half year before be facing away from it now at noon?
The Earth takes 24 hours to spin around its own axis and 365 days to spin around the Sun. So in approximately half a year the Earth will have spun around its axis 182.5 times.
Now take a look at the ...
- 555
0
votes
4
answers
1k
views
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
1
vote
0
answers
55
views
What is the mass of rotation of Earth? [closed]
This question means "what is the additional mass which Earth has due to its rotational kinetic energy and mass-energy equivalence, as opposed to hypothetical non-rotating Earth"?
How could I ...
4
votes
6
answers
6k
views
Air flight and Earth's rotation
I read a response asking why flights of equal distance east and west take roughly the same time (disregarding wind actions). I have trouble visualizing part of the answer; "the speed of the rotation ...
- 53
0
votes
3
answers
4k
views
Direction of deflection of Coriolis force on Earth
I'm a bit confused about Coriolis force direction on Earth. The observed deflection is to the right in the northern emisphere and to the left in the southern one.
But what about an observer in the ...
- 2,617
0
votes
1
answer
615
views
Coriolis object deflection and conservation of angular momenutum
I'm trying to understan kinematic inertial explanation of the apparent deviation of objects due to fictitious forces in rotating Earth.
Take an object moving from the equator northwards, or ...
- 2,617
1
vote
0
answers
25
views
What force is needed to turn the Earth Pole-over Pole. Eg. UK now on Equator? [closed]
Specifically, if someone could specify the Joules energy required to force the Earth to slowly rotate the poles end-to-end by say 1 degrees rotation, and by 5 degrees.
To be clear I mean to literally ...
- 11
-1
votes
4
answers
6k
views
Why does earth spin counter-clockwise?
If we observe the earth from the north pole, we can see that the earth is rotating counter clock wise direction. The earth spins due to angular momentum, but why only in counter clock wise.
Why ...
- 438
2
votes
2
answers
850
views
How does Foucault's pendulum work in a place other than the poles?
I find it easy to understand how Foucault's pendulum works at the poles, the pendulum oscillates in a fixed plane and we, along with the earth, rotate around it. So it appears that the pendulum's ...
- 646
7
votes
4
answers
2k
views
Will the sea form a concave surface?
Without neglecting the fact that the earth is rotating, let us be in a ship (such that there is no relative motion between sea and ship) in a sea that surrounds the northern most or southern most ...
user79290
3
votes
2
answers
1k
views
Can we calculate the frame dragging force of the Earth?
Although clearly this force would be significantly greater with a rotating black hole, is it still possible to calculate this drag for say a satellite orbiting the Earth?
- 615
0
votes
1
answer
1k
views
Does the Earth's rotation affect an object in the stratosphere?
Does the Earth's rotation affect an object in the stratosphere?
Example: I attach an object to a weather balloon and let it go at latitude +40.7, longitude -73.9 (New York). It goes up until it hits ...
- 3
5
votes
1
answer
2k
views
Does the Earth rotate vertically too?
We know that the earth has seen several Ice Ages.
And we know the Earth's magnetic poles seem to flip once in a while.
Could all of this be explained by a once every 250 Million Years or so the ...
- 821
0
votes
1
answer
2k
views
Will we gain some extra hours if we travel in the direction of the rotation of the earth? [closed]
I heard that If we travel for long distances in the direction of the rotation of the earth, we can gain some extra hours in the journey.
Is it true? What if we travel in the opposite direction?
- 101
56
votes
8
answers
44k
views
Proof that the Earth rotates?
What is the proof, without leaving the Earth, and involving only basic physics, that the earth rotates around its axis?
By basic physics I mean the physics that the early physicists must've used to ...
- 563
2
votes
1
answer
369
views
Does the Earth rotate the same encased in ice during the height of an Ice Age as it does when the bulk of it's water is liquid and always in motion?
Ice Age vs. Now.
Does the Earth rotate at the same rate when encased in ice during the height of an Ice Age as it does when the bulk of it's water is liquid and always in motion?
- 715
38
votes
8
answers
16k
views
Would it matter if the Earth rotated clockwise?
In the Futurama episode "That Darn Katz!" they save the world by rotating the Earth backwards saying it shouldn't matter (which direction Earth rotates). If Earth rotated clockwise and remained in it'...
- 715
5
votes
5
answers
4k
views
Why doesn't the Earth release you as soon as you escape it?
I've always wondered, that since the Earth is moving at a very fast velocity around the Sun, why is it that when astronauts leave the Earth, the Earth doesn't immediately move away from them at ...
- 1,158
5
votes
5
answers
5k
views
Video of Earth spinning?
If the Earth is spinning or rotating at a really fast speed, why haven't we seen any videos from space of it spinning when we get a lot of photos of it?
- 1,158
13
votes
2
answers
3k
views
If the Earth didn't rotate, how would a Foucault pendulum work?
How does the Foucault pendulum work exactly, and would it work at all, if the Earth didn't rotate?
Foucault
1
vote
2
answers
2k
views
Argument for proving Earth-Centered Earth-Fixed (ECEF) reference frame is non-inertial
Today I heard an argument to prove that the Earth-Centered Earth-Fixed (ECEF) reference frame is non-inertial. It seriously doesn't make any sense to me but I also heard that same argument was made by ...
user4235
-2
votes
1
answer
372
views
How can the Earth's day increase and its rotation slow down at the same time? [closed]
I heard that the Earth rotation is slowing down, but I also heard the Earth's length of day is increasing.
Does the two theories go together or conflict with each other?
- 185