20 Aug 14
Originally posted by Great Big SteesThere is no earth "Terra firma" at the North Pole. There is a huge hole which leads to an inner Earth warmed by an internal Sun. That's where the Lizardmen live.
How 'bout we all head for the Northern most part of Mother Earth and just start jumping. We may be able to flatten her.
Thought you knew
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20 Aug 14
Originally posted by ChessPraxisI did actually, it just slipped my mind...musta been that demon weed.
There is no earth "Terra firma" at the North Pole. There is a huge hole which leads to an inner Earth warmed by an internal Sun. That's where the Lizardmen live.
Thought you knew
25 Aug 14
Originally posted by sonhouseWhy would we be on the same time zone on a flat earth?
Dam round planet! I am at work and have to wait 3 frigging hours to get hold of the left coast. If we lived on a flat Earth we would all have the same time zone. Anything we can do about that?
The sun will rotate around the earth I presume and then you have the same east-west problem like before...
But the wagon of Sol would be a real nice vehicle to wonder about 🙂
25 Aug 14
Originally posted by PonderableAccording to Copernicus and some other smart people, the sun doesn't travel around the earth.
The sun will rotate around the earth I presume and then you have the same east-west problem like before...
The "east-west problem" exists because the earth rotates on its axis and revolves around the sun.
Whether or not a flat earth would rotate or revolve or move at all is open to conjecture.
25 Aug 14
Originally posted by HandyAndyA rotating flat earth would be really great, think of the different velocities experienced at different locations...
According to Copernicus and some other smart people, the sun doesn't travel around the earth.
The "east-west problem" exists because the earth rotates on its axis and revolves around the sun.
Whether or not a flat earth would rotate or revolve or move at all is open to conjecture.
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25 Aug 14
Originally posted by PonderableActually the rotational speeds are the same on a rotating flat plane and a rotating sphere with the same axis and diameter. A point one meter from the North Pole rotates around the pole once every 24 hours for a total distance of 2 pi meters per day, and a point at the equator goes about 13,000 pi meters per day. This would be the same if the earth were a rotating disc.
A rotating flat earth would be really great, think of the different velocities experienced at different locations...
I think.
25 Aug 14
Originally posted by JS357You are right, but I was thining about a disc rotating on a diamter instead a centric axis.
Actually the rotational speeds are the same on a rotating flat plane and a rotating sphere with the same axis and diameter. A point one meter from the North Pole rotates around the pole once every 24 hours for a total distance of 2 pi meters per day, and a point at the equator goes about 13,000 pi meters per day. This would be the same if the earth were a rotating disc.
I think.
25 Aug 14
Originally posted by PonderableIt would make an interesting experiment to make a small version to launch into space, say a disc 100 meters across and 1 meter thick then put into orbit say a million klicks from Earth but in the same orbit. Let it rotate in various ways, see what it would be like on Earth if the disk was 12,000 km across and some significant thickness.
You are right, but I was thining about a disc rotating on a diamter instead a centric axis.
I guess a planet like that could not exist since the gravity of it would force it back into more or less spherical shape.
So how fast would a 12,000 Km disk have to spin to keep gravity at bay and still maintain the disk shape? Would it be slow enough to be habitable?
You probably know about the Ringworld Sci fi series, that is basically a ribbon at some distance from the sun going 360 degrees all around the sun but what about a habitable disk the size of Earth? Could it exist in reality given our laws of physics as we know them?
25 Aug 14
Originally posted by sonhouseYes Ringworld is feasible, though it is questionable about the big ring caryying the areas to make the night plus the questin how thick it would have to be to maintain atmosphere...
It would make an interesting experiment to make a small version to launch into space, say a disc 100 meters across and 1 meter thick then put into orbit say a million klicks from Earth but in the same orbit. Let it rotate in various ways, see what it would be like on Earth if the disk was 12,000 km across and some significant thickness.
I guess a planet ...[text shortened]... ble disk the size of Earth? Could it exist in reality given our laws of physics as we know them?
Dyson has proposed what is called a Dysonsphere as a space habitat
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25 Aug 14
Originally posted by PonderableIs he the guy that invented the Dyson vacuum cleaners?
Yes Ringworld is feasible, though it is questionable about the big ring caryying the areas to make the night plus the questin how thick it would have to be to maintain atmosphere...
Dyson has proposed what is called a Dysonsphere as a space habitat
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25 Aug 14
Originally posted by sonhouseI am more familiar with Terry Pratchett's discworld.
It would make an interesting experiment to make a small version to launch into space, say a disc 100 meters across and 1 meter thick then put into orbit say a million klicks from Earth but in the same orbit. Let it rotate in various ways, see what it would be like on Earth if the disk was 12,000 km across and some significant thickness.
I guess a planet ...[text shortened]... ble disk the size of Earth? Could it exist in reality given our laws of physics as we know them?
I remember the concept of a space station that was a torus with people living in the hollow ring. The station rotated around its axis like a bicycle wheel, and the rotational rate was designed to provide a centrifugal force of one earth G. I believe this was depicted in Kubrick's 2001 a space odyssey. I wonder what the rotational rate would need to be for a given diameter.
Somebody's figured it out:
"In the 1950s, Wernher von Braun and Willy Ley, writing in Colliers Magazine, updated the idea, in part as a way to stage spacecraft headed for Mars. They envisioned a rotating wheel with a diameter of 76 meters (250 feet). The 3-deck wheel would revolve at 3 RPM to provide artificial one-third gravity. It was envisaged as having a crew of 80."
http://en.wikipedia.org/wiki/Rotating_wheel_space_station
25 Aug 14
Originally posted by JS357Speed (distance divided by time) isn't the same as velocity. During a 24-hour period, the point at
Actually the rotational speeds are the same on a rotating flat plane and a rotating sphere with the same axis and diameter. A point one meter from the North Pole rotates around the pole once every 24 hours for a total distance of 2 pi meters per day, and a point at the equator goes about 13,000 pi meters per day. This would be the same if the earth were a rotating disc.
I think.
the equator travels a much greater distance than the point near the pole. Velocity, on the other
hand, is a vector quantity that measures the rate at which an object changes its position.
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25 Aug 14
Originally posted by HandyAndyI just changed position but forgot to record the velocity. Let me do it again. I'll get back to ya.
Speed (distance divided by time) isn't the same as velocity. During a 24-hour period, the point at
the equator travels a much greater distance than the point near the pole. Velocity, on the other
hand, is a vector quantity that measures the rate at which an object changes its position.
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25 Aug 14
Originally posted by HandyAndyI know. That's why I said speed. The way I learned it, velocity includes both magnitude and direction. I didn't want to get into discussion of the rate of directional change of points on a rotating sphere vs points on a rotating disc.
Speed (distance divided by time) isn't the same as velocity. During a 24-hour period, the point at
the equator travels a much greater distance than the point near the pole. Velocity, on the other
hand, is a vector quantity that measures the rate at which an object changes its position.