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Post by Deleted on Oct 11, 2019 12:30:52 GMT
Tides are causing the earth to slow down, apparently, but this is causing the moon to pull away 3cms per year. I wonder if it will get to a point where the moon stops causing tides, and the planet then equalises at that speed. What is intresting is the planet is slowing down causing a day to be about 2 milliseconds longer over a century. With the earth spinning at 1000mph how long will it take? Quite a long time. You definitely have time for a cuppa. I can't remember if the sun is supposed to have become a supernova before then or not though.
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Post by Deleted on Oct 11, 2019 12:32:31 GMT
7,268,943,871 years 345 days 12 hours 16 minutes and 32 seconds.
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Post by thebfg on Oct 11, 2019 12:32:35 GMT
Just having a bit of a read and the last few ices ages were ended by tidal forces.
The earths orbital eccentricity has a massive part in ice age and greenhouse age (would that be correct terminology?)
Tidal forces affect the earth's bulges.
The more and more I read into this I believe that global warming is a natural phenomena, but we may be speeding it up. Comparing it to the last one.
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Post by Deleted on Oct 11, 2019 12:34:06 GMT
It's bound to be a natural phenomenon when you think about it.
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Post by Telemachus on Oct 11, 2019 12:41:35 GMT
Tides are causing the earth to slow down, apparently, but this is causing the moon to pull away 3cms per year. I wonder if it will get to a point where the moon stops causing tides, and the planet then equalises at that speed. What is intresting is the planet is slowing down causing a day to be about 2 milliseconds longer over a century. With the earth spinning at 1000mph how long will it take to stop? Well perhaps long enough for you to gain some clue about units and dimensional analysis. A spin rate cannot be measured in mph any more than it could be measured in kilogrammes or number of oranges. The dimensions of spinning are merely 1/time (as in revs/minute)
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Post by Telemachus on Oct 11, 2019 12:44:29 GMT
It's bound to be a natural phenomenon when you think about it. Obviously, since human beings are "natural" - ie created by nature.
Except for me of course, I am (according to some) unnatural.
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Post by Trina on Oct 11, 2019 12:52:03 GMT
I'd have thought you'd be supernatural...
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Post by thebfg on Oct 11, 2019 13:29:45 GMT
Tides are causing the earth to slow down, apparently, but this is causing the moon to pull away 3cms per year. I wonder if it will get to a point where the moon stops causing tides, and the planet then equalises at that speed. What is intresting is the planet is slowing down causing a day to be about 2 milliseconds longer over a century. With the earth spinning at 1000mph how long will it take to stop? Well perhaps long enough for you to gain some clue about units and dimensional analysis. A spin rate cannot be measured in mph any more than it could be measured in kilogrammes or number of oranges. The dimensions of spinning are merely 1/time (as in revs/minute) You better query the experts, it's how they described it. The speed relates to the speed of the surface at the equator. You are right but I have not found a single website that gives an rpm measurement. Which I do fully understand thanks. My guess is it's around 1 revolution in 1440 minutes. Which of course has absolutely no relevance to anything if you want to actually visualise the speed it is spinning.
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Post by Telemachus on Oct 11, 2019 14:19:51 GMT
Well perhaps long enough for you to gain some clue about units and dimensional analysis. A spin rate cannot be measured in mph any more than it could be measured in kilogrammes or number of oranges. The dimensions of spinning are merely 1/time (as in revs/minute) You better query the experts, it's how they described it. The speed relates to the speed of the surface at the equator. You are right but I have not found a single website that gives an rpm measurement. Which I do fully understand thanks. My guess is it's around 1 revolution in 1440 minutes. Which of course has absolutely no relevance to anything if you want to actually visualise the speed it is spinning. Not my fault if the experts donβt know what they are talking about. And clearly they are not experts at all, if they measure rotational speed in mph! Obviously they never went to a proper school. Anyway you are right about the 1440 (give or take a tiny bit), but in terms of rpm that is 0.00069444 rpm. I would say that that is absolutely relevant to visualising the speed it is spinning. Ie very slowly! Youβd only have to lose 0.001rpm and it would be going backwards. Now that would be confusing.
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Post by bodger on Oct 11, 2019 14:29:14 GMT
clearly measuring the earth's rotation in RPM is an abuse of conventional measuring units.
something as critical as the earth's rotation should only ever by measured in radians per millisecond.
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Post by JohnV on Oct 11, 2019 14:30:59 GMT
pardon ? radios per microphone was that ?
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Post by bodger on Oct 11, 2019 14:35:48 GMT
No if you cut down the trees and flattened the mountains, the planet wouldnβt spin any faster (conservation of angular momentum considerations aside). But it would slow down less quickly. so we could compensate for the erection of millions of wind turbines of ever larger dimensions by the simple procedure of flattening mountains and felling forests, to be done at a carefully controlled rate to keep the plate earth spinning at its present rate, measured in the most appropriate units of course. All it needs is a few clever scientists to specify the necessary rate of felling and flattening. This could have side benefits, including the creation of meaningful employment for Nepalese youths who do want to waste their lives carrying fat Russians and Japanese to the summit of Everest.
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Post by Telemachus on Oct 11, 2019 14:46:15 GMT
No if you cut down the trees and flattened the mountains, the planet wouldnβt spin any faster (conservation of angular momentum considerations aside). But it would slow down less quickly. so we could compensate for the erection of millions of wind turbines of ever larger dimensions by the simple procedure of flattening mountains and felling forests, to be done at a carefully controlled rate to keep the plate earth spinning at its present rate, measured in the most appropriate units of course. All it needs is a few clever scientists to specify the necessary rate of felling and flattening. This could have side benefits, including the creation of meaningful employment for Nepalese youths who do want to waste their lives carrying fat Russians and Japanese to the summit of Everest. Yes it is certainly fortunate that the felling of large parts of the Amazon rainforest is helping to reduce the inevitable rotational speed reduction. Which is why I have a large number of shares in Amazon Timber Exporters. And very profitable they are too - but of course my reasons for holding them are purely ethical, not financial.
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Post by Telemachus on Oct 11, 2019 14:47:40 GMT
clearly measuring the earth's rotation in RPM is an abuse of conventional measuring units. something as critical as the earth's rotation should only ever by measured in radians per millisecond. You can measure it in whatever units you like, as long as it is dimensionally correct.
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Post by thebfg on Oct 11, 2019 15:08:51 GMT
You better query the experts, it's how they described it. The speed relates to the speed of the surface at the equator. You are right but I have not found a single website that gives an rpm measurement. Which I do fully understand thanks. My guess is it's around 1 revolution in 1440 minutes. Which of course has absolutely no relevance to anything if you want to actually visualise the speed it is spinning. And clearly they are not experts at all, if they measure rotational speed in mph! Obviously they never went to a proper school. Except as I explained after it is the Tangential speed of a point on the surface and not rotational speed. Learned that word today.
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