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Post by Jim on Oct 11, 2019 15:10:39 GMT
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. Well, that fits us nicely, we are good at going off on tangents.
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Post by Deleted on Oct 11, 2019 15:11:18 GMT
You can tell the speed of a Hudson narrow boat using the Rivets Per Minute formula.
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Post by Telemachus on Oct 11, 2019 16:05:48 GMT
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. Which is fine if you want to describe tangential speed. But not if you want to describe “spinning”. Anyway, tangential speed varies from zero at the poles, to quite fast at the equator, and faster on top of a mountain than at sea level. So not a useful general measurement. Whereas rotational speed (even if measured in radians per millisecond) is a single value that covers the entire planet.
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Post by Telemachus on Oct 11, 2019 16:06:40 GMT
You can tell the speed of a Hudson narrow boat using the Rivets Per Minute formula. What about the Hudson narrowboats that don’t have rivets?
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Post by JohnV on Oct 11, 2019 16:14:31 GMT
You can tell the speed of a Hudson narrow boat using the Rivets Per Minute formula. What about the Hudson narrowboats that don’t have rivets? without rivets ...... is that stealth technology ?
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Post by metanoia on Oct 11, 2019 16:22:04 GMT
What about the Hudson narrowboats that don’t have rivets? without rivets ...... is that stealth technology ? ….. misplaced wealth technology ….? met x
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Post by thebfg on Oct 11, 2019 17:19:55 GMT
Except as I explained after it is the Tangential speed of a point on the surface and not rotational speed. Learned that word today. Which is fine if you want to describe tangential speed. But not if you want to describe “spinning”. Anyway, tangential speed varies from zero at the poles, to quite fast at the equator, and faster on top of a mountain than at sea level. So not a useful general measurement. Whereas rotational speed (even if measured in radians per millisecond) is a single value that covers the entire planet. Which is why I clearly wrote, equator so it was clear. It was a small point in a post. Get over it Instead of being a pendant why don't you answer the question of how long
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Post by bodger on Oct 11, 2019 18:26:19 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. well, that's very magnanimous of you. thankyou.
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Post by naughtyfox on Oct 11, 2019 19:21:44 GMT
Which is fine if you want to describe tangential speed. But not if you want to describe “spinning”. Anyway, tangential speed varies from zero at the poles, to quite fast at the equator, and faster on top of a mountain than at sea level. So not a useful general measurement. Whereas rotational speed (even if measured in radians per millisecond) is a single value that covers the entire planet. Instead of being a pendant Shorthand for 'bell end'.
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Post by peterboat on Oct 11, 2019 20:12:40 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. I think we are the straw that has broken the camels back! I think its to late to reverse the changes caused by our burning fosil fuels like there is no tomorrow! I am sort of now thinking I wont get old anymore as the changes are that fast and constant, best I can hope for is to stay on the boat until it happens, apart from that a big meteorite apparently is heading our way in 2029 and its going to be a close run thing whether it gets us or not, deep joy!!
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Post by Deleted on Oct 11, 2019 21:25:51 GMT
I reckon it's all bollocks.
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Post by Telemachus on Oct 11, 2019 22:26:05 GMT
Which is fine if you want to describe tangential speed. But not if you want to describe “spinning”. Anyway, tangential speed varies from zero at the poles, to quite fast at the equator, and faster on top of a mountain than at sea level. So not a useful general measurement. Whereas rotational speed (even if measured in radians per millisecond) is a single value that covers the entire planet. Which is why I clearly wrote, equator so it was clear. It was a small point in a post. Get over it Instead of being a pendant why don't you answer the question of how long Ah but which small point in the post? If near the top of the post, the tangential speed would be greater than if near the bottom. As to length, in your case, 4 inches. But if you measured it in radians per millisecond no doubt, with rounding up, you could make out it was 7.
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Post by JohnV on Oct 12, 2019 6:11:38 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. apart from that a big meteorite apparently is heading our way in 2029 and its going to be a close run thing whether it gets us or not, deep joy!! greens/environmentalists/flatearthers/........ hell, humans generally, think we live on a world that runs along nice clear, stable lines. Sigh !!! We live on a tectonically unstable planet circling a variable star in a wildly variable orbit. We are positioned on the outer spiral arm of a galaxy which may or may not have a black hole as it's centre. Positioned in an area of space full of vast quantities of rubble left over from the formation of this and maybe many other solar systems, all travelling at high speeds in every direction imaginable. We think of 100 years as being a enormously long time ....... but live in a universe where a million years is just an eyeblink. Peter is probably right, the industrial revolution and the burning of fossil fuels is probably the butterfly's wing of chaos theory. If it wasn't that, it would have been something else. the balance of nature is out of sync and tinkering round the edges with environmentalism is simply that .... tinkering round the edges.
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Post by patty on Oct 12, 2019 6:29:19 GMT
apart from that a big meteorite apparently is heading our way in 2029 and its going to be a close run thing whether it gets us or not, deep joy!! greens/environmentalists/flatearthers/........ hell, humans generally, think we live on a world that runs along nice clear, stable lines. Sigh !!! We live on a tectonically unstable planet circling a variable star in a wildly variable orbit. We are positioned on the outer spiral arm of a galaxy which may or may not have a black hole as it's centre. Positioned in an area of space full of vast quantities of rubble left over from the formation of this and maybe many other solar systems, all travelling at high speeds in every direction imaginable. We think of 100 years as being a enormously long time ....... but live in a universe where a million years is just an eyeblink. Peter is probably right, the industrial revolution and the burning of fossil fuels is probably the butterfly's wing of chaos theory. If it wasn't that, it would have been something else. the balance of nature is out of sync and tinkering round the edges with environmentalism is simply that .... tinkering round the edges. That all seems a tad depressing.. I guess I'll just get on with doing my little bit but balance it with getting the most out of life. Seems strange in the vastness of things how folk allow the triviality of day to day events to demoralise and upset them. But I suppose the trivial distracts from the whole pic and folks on the whole are self cantered and just focus on themselves.
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Post by Jim on Oct 12, 2019 8:27:37 GMT
Which is why I clearly wrote, equator so it was clear. It was a small point in a post. Get over it Instead of being a pendant why don't you answer the question of how long Ah but which small point in the post? If near the top of the post, the tangential speed would be greater than if near the bottom. As to length, in your case, 4 inches. But if you measured it in radians per millisecond no doubt, with rounding up, you could make out it was 7. Are you accounting for the fact that centripetal force will make it longer? Hopefully.
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