Editing Talk:2413: Pulsar Analogy
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:Hand joint exercises. Gentle motions with the wrist bent backwards, and bent forwards; 3-5 circles in both directions and both postures, twice a day. [[Special:Contributions/162.158.62.41|162.158.62.41]] 00:48, 19 January 2021 (UTC) | :Hand joint exercises. Gentle motions with the wrist bent backwards, and bent forwards; 3-5 circles in both directions and both postures, twice a day. [[Special:Contributions/162.158.62.41|162.158.62.41]] 00:48, 19 January 2021 (UTC) | ||
[[Special:Contributions/172.69.35.149|172.69.35.149]] 23:38, 18 January 2021 (UTC) | [[Special:Contributions/172.69.35.149|172.69.35.149]] 23:38, 18 January 2021 (UTC) | ||
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The analogy doesn't seem to be inaccurate in the way currently indicated. In both cases (tape measure and pulsar), conservation of ''angular'' momentum is what produces the result. With the tape measure, a small fast-spinning thing turns into a large slow-spinning thing; the opposite happens with a pulsar. [[Special:Contributions/172.69.35.150|172.69.35.150]] 00:05, 19 January 2021 (UTC) | The analogy doesn't seem to be inaccurate in the way currently indicated. In both cases (tape measure and pulsar), conservation of ''angular'' momentum is what produces the result. With the tape measure, a small fast-spinning thing turns into a large slow-spinning thing; the opposite happens with a pulsar. [[Special:Contributions/172.69.35.150|172.69.35.150]] 00:05, 19 January 2021 (UTC) | ||
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:::Of course, on a frictionless surface there's some slow retrograde rotation of the case + extended tape that speeds up as the tape retracts, but the case should completely stop spinning once the tape is fully retracted in that scenario, which is opposite of the analogy being drawn. [[Special:Contributions/172.69.34.12|172.69.34.12]] 02:43, 19 January 2021 (UTC) | :::Of course, on a frictionless surface there's some slow retrograde rotation of the case + extended tape that speeds up as the tape retracts, but the case should completely stop spinning once the tape is fully retracted in that scenario, which is opposite of the analogy being drawn. [[Special:Contributions/172.69.34.12|172.69.34.12]] 02:43, 19 January 2021 (UTC) | ||
::::On a frictionless surface, it would ''never'' stop spinning. Once the case starts to spin, there's nothing to slow it down. --[[Special:Contributions/172.69.63.183|172.69.63.183]] 17:45, 19 January 2021 (UTC) | ::::On a frictionless surface, it would ''never'' stop spinning. Once the case starts to spin, there's nothing to slow it down. --[[Special:Contributions/172.69.63.183|172.69.63.183]] 17:45, 19 January 2021 (UTC) | ||
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::: It seems to me like the reason the full tape measure spins is somewhat similar to an Impact Driver. Shooting slow motion videos of retracting my tape measure I see a small rotation in the opposite direction of the rotation in the end (likely due to the device maintaining angular momentum as the spring inside spins up) and then a quick snap when the tape is fully retracted, followed by the tape spinning very quickly in the opposite direction. As for my comparison to an impact, this reminds me a lot of how those work, with some inner barrel spinning at a very high speed, and then mechanically imparting that energy onto the body of the driving head, causing it to turn with a high torque. Typically when you start an impact spinning you can feel a small torque opposite to how the driver end spins because of the inner barrel spinning up. In the tape measure the inner spinning barrel is the tape itself and the spring to retract it, the driver head is the outer shell of the tape measure. [[User:dlvozza|dlvozza]] ([[User talk:dlvozza|talk]]) 19:48, 19 January 2021 (UTC) | ::: It seems to me like the reason the full tape measure spins is somewhat similar to an Impact Driver. Shooting slow motion videos of retracting my tape measure I see a small rotation in the opposite direction of the rotation in the end (likely due to the device maintaining angular momentum as the spring inside spins up) and then a quick snap when the tape is fully retracted, followed by the tape spinning very quickly in the opposite direction. As for my comparison to an impact, this reminds me a lot of how those work, with some inner barrel spinning at a very high speed, and then mechanically imparting that energy onto the body of the driving head, causing it to turn with a high torque. Typically when you start an impact spinning you can feel a small torque opposite to how the driver end spins because of the inner barrel spinning up. In the tape measure the inner spinning barrel is the tape itself and the spring to retract it, the driver head is the outer shell of the tape measure. [[User:dlvozza|dlvozza]] ([[User talk:dlvozza|talk]]) 19:48, 19 January 2021 (UTC) | ||
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:The word "dead" can be used to refer to inactivity in an object that was never classically alive. i.e. dead volcanoes --[[Special:Contributions/188.114.102.60|188.114.102.60]] 15:55, 19 January 2021 (UTC) | :The word "dead" can be used to refer to inactivity in an object that was never classically alive. i.e. dead volcanoes --[[Special:Contributions/188.114.102.60|188.114.102.60]] 15:55, 19 January 2021 (UTC) | ||
:Humans aren't the only things that can be alive or dead, so calling it anthropomorphization is way off mark. But besides that, stellar objects aren't all "dead", they're non-living. You have to be alive and then die to be dead, in the biological sense. But in this case, it's called a "dead stellar core" because it no longer has sustained fusion reactions which is what stars are known for, just like a battery that's used up all of its charge is called "Dead" - not because we're assigning human qualities, but because it doesn't do what it's supposed to. Same with any non-living thing that doesn't function as expected being referred to as dead. --[[Special:Contributions/172.69.63.183|172.69.63.183]] 17:41, 19 January 2021 (UTC) | :Humans aren't the only things that can be alive or dead, so calling it anthropomorphization is way off mark. But besides that, stellar objects aren't all "dead", they're non-living. You have to be alive and then die to be dead, in the biological sense. But in this case, it's called a "dead stellar core" because it no longer has sustained fusion reactions which is what stars are known for, just like a battery that's used up all of its charge is called "Dead" - not because we're assigning human qualities, but because it doesn't do what it's supposed to. Same with any non-living thing that doesn't function as expected being referred to as dead. --[[Special:Contributions/172.69.63.183|172.69.63.183]] 17:41, 19 January 2021 (UTC) | ||
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