⚓️anchor
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Post by ⚓️anchor on Apr 21, 2018 11:06:09 GMT
There are various speed tests you can take to determine how fast your connection is. Here is one: www.speedtest.net/I got this result: PING 7 ms DOWNLOAD 10.19 Mbps UPLOAD 5.27 Mbps |
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illusion
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Post by illusion on May 15, 2018 15:48:41 GMT
Speed can be relative in other ways than related to computers. When we measure speed, we commonly stand on Earth. A physicist would therefore say that the speed is measured relative to Earth.
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⚓️anchor
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Post by ⚓️anchor on May 16, 2018 22:22:08 GMT
The surface of the earth at the equator moves at a speed of 460 meters per second - or roughly 1,000 miles per hour.
The earth is moving about our sun at a speed of nearly 30 kilometers per second or 67,000 miles per hour.
In addition, our solar system - the earth and all - whirls around the center of our galaxy at some 220 kilometers per second or 490,000 miles per hour.
So yes, speed is absolutely relative!
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mac
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Post by mac on May 19, 2018 13:42:44 GMT
Make sure that you hold on to something solid and don't become dizzy! smiley-laughing024
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⚓️anchor
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Post by ⚓️anchor on May 24, 2018 19:04:36 GMT
I would like to know how the adherents of the flat earth theory calculate the rotation of their disk!
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illusion
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Post by illusion on Jun 3, 2018 19:41:16 GMT
I'm surprised that there still are serious flat earth adherents out there.  |
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⚓️anchor
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Post by ⚓️anchor on Jun 4, 2018 18:52:43 GMT
I'm surprised that there still are serious flat earth adherents out there. Yes, most of them should have fallen off the edge by now!  |
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illusion
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Post by illusion on Jun 21, 2018 14:11:02 GMT
From a philosophical point of view, speed is definitely relative,
Imagine two people standing some distance from each other in a white room without reference points. If one person starts moving towards the other, the only way to define their speed is by measuring their difference of position relative to a fixed position, which is most likely the other person. But who is moving? Both persons could make the case that the other is moving, not themselves.
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⚓️anchor
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Post by ⚓️anchor on Jun 22, 2018 15:39:44 GMT
Or both are moving and meeting in the middle.
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mac
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Post by mac on Jun 25, 2018 10:45:33 GMT
A philosophical question:
If you had a gun that could fire a bullet so fast that it would travel all the way around Earth, would it gain a different speed if you aimed it east or west because of the rotaion?
I don't know the answer, but I hope that somebody will try to solve this riddle.
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⚓️anchor
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Post by ⚓️anchor on Jun 26, 2018 10:10:42 GMT
William Stoertz, consultant at Unification Thought Institute, can perhaps shed some light on this issue. "The speed of the bullet relative to someone on the surface near where it is fired is the same no matter which direction, because the added velocity of the earth’s rotation is the same for the observer too. So it wouldn’t make any difference on a local scale. However, if you are talking about orbital type of speeds (approaching 5 miles/second) and large distances (more than 10 degrees of longitude), then you would start to notice differences. If the bullet is headed in the direction of the earth’s rotation, then it can go into orbit; but if it is headed in the opposite direction, it will fall down to the ground.
The air is moving just the same speed as the turning of the earth (1,000 miles/hour at the equator). So the bullet is not being helped nor hindered in its motion by the wind. However, again, the air will significantly slow down the bullet in any direction you fire it. Let’s say you get it up to 5 miles/second (way faster than any rifle bullet!). Then it will burn to a cinder in a bright white spark because of the air friction. Plus, another lesser factor: The prevailing winds are different in different places and different latitudes. But in general the winds blow in the direction the earth is turning, i.e. from west to east. For example, at altitudes of about 30,000 feet or so, jet streams can reach over 200 miles/hour. So, if your projectile catches the jet stream, it will be helped along significantly, especially in the direction of the earth’s rotation, because that is the direction the upper-latitude jet streams generally flow." |
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illusion
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Post by illusion on Jul 9, 2018 21:51:20 GMT
What can go 5 miles per second? A laser beam?
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⚓️anchor
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Post by ⚓️anchor on Jul 10, 2018 12:25:23 GMT
" One of the most sacred laws of physics is that nothing can travel faster than the speed of light in vacuum. But this speed limit has been smashed in a recent experiment in which a laser pulse travels at more than 300 times the speed of light (L J Wang et al. 2000 Nature 406 277). However, the laws of physics remain intact because Lijun Wang and colleagues at the NEC Research Institute in Princeton in the US are able to explain the results of their experiment in terms of the classical theory of wave propagation." physicsworld.com/a/laser-smashes-light-speed-record/ |
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mac
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Post by mac on Jul 13, 2018 12:24:15 GMT
So, speed, earth rotation, wind and atmospheric density matters. Thanks!  |
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