Editing Talk:1473: Location Sharing
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I may be thinking too much into this, but couldn't she also not want the website to know her mass? Momentum is Mass*Velocity, and Velocity can be derived from change in position [[Special:Contributions/173.245.56.159|173.245.56.159]] 05:34, 14 January 2015 (UTC) | I may be thinking too much into this, but couldn't she also not want the website to know her mass? Momentum is Mass*Velocity, and Velocity can be derived from change in position [[Special:Contributions/173.245.56.159|173.245.56.159]] 05:34, 14 January 2015 (UTC) | ||
:That was my understanding, too. Moreover, I don't see any humor in applying the uncertainity principle to macroscopic objects. [[Special:Contributions/108.162.254.57|108.162.254.57]] 08:53, 14 January 2015 (UTC) | :That was my understanding, too. Moreover, I don't see any humor in applying the uncertainity principle to macroscopic objects. [[Special:Contributions/108.162.254.57|108.162.254.57]] 08:53, 14 January 2015 (UTC) | ||
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Angular momentum sensors - a.k.a. gyros, not accelerometers. {{unsigned ip|141.101.80.109}} | Angular momentum sensors - a.k.a. gyros, not accelerometers. {{unsigned ip|141.101.80.109}} | ||
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Plus, to the "I don't see any humor in applying the uncertainity principle to macroscopic objects." person, above, please pass by your local XKCD offices at the first opportunity in order to hand back your XKCD Membership Card. You're obviously not one of us! ;) [[Special:Contributions/141.101.98.191|141.101.98.191]] 16:28, 14 January 2015 (UTC) | Plus, to the "I don't see any humor in applying the uncertainity principle to macroscopic objects." person, above, please pass by your local XKCD offices at the first opportunity in order to hand back your XKCD Membership Card. You're obviously not one of us! ;) [[Special:Contributions/141.101.98.191|141.101.98.191]] 16:28, 14 January 2015 (UTC) | ||
::My goodness, yes! What a lot of seriousness has found its way into this discussion! How could anyone miss the humo[u]r in the personification of a subatomic particle as a Megan?[[User:Taibhse|Taibhse]] ([[User talk:Taibhse|talk]]) 04:23, 15 January 2015 (UTC) | ::My goodness, yes! What a lot of seriousness has found its way into this discussion! How could anyone miss the humo[u]r in the personification of a subatomic particle as a Megan?[[User:Taibhse|Taibhse]] ([[User talk:Taibhse|talk]]) 04:23, 15 January 2015 (UTC) | ||
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Per the explanation: "Randall suggests the poor accuracy of the compasses in mobile phones (measuring the angular position) is due to the gyroscopes being too good. (If both the gyroscope and the compasses were completely accurate, it would violate the uncertainty principle)." | Per the explanation: "Randall suggests the poor accuracy of the compasses in mobile phones (measuring the angular position) is due to the gyroscopes being too good. (If both the gyroscope and the compasses were completely accurate, it would violate the uncertainty principle)." | ||
The compass points in a particular direction but tells you nothing about location or momentum. How would it be involved in any violation of Uncertainty? The gyroscope and GPS I could see, maybe. But the compass? I don't see how it combined with anything could involve Uncertainty. - Equinox [[Special:Contributions/199.27.128.117|199.27.128.117]] 16:46, 14 January 2015 (UTC) | The compass points in a particular direction but tells you nothing about location or momentum. How would it be involved in any violation of Uncertainty? The gyroscope and GPS I could see, maybe. But the compass? I don't see how it combined with anything could involve Uncertainty. - Equinox [[Special:Contributions/199.27.128.117|199.27.128.117]] 16:46, 14 January 2015 (UTC) | ||
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The way I read this, by knowing her current location AND momentum (ignoring the uncertainty principle thing for the moment) it becomes possible to predict where whe'll be in the future, which would open up all sorts of ... 'interesting' marketing opportunities for the app maker. Megan doesn't mind the app knowing where she *is*, but doesn't want it to know where she's *going*, and so rejects the second seemingly innocent question. Maybe? {{unsigned ip|108.162.249.205}} | The way I read this, by knowing her current location AND momentum (ignoring the uncertainty principle thing for the moment) it becomes possible to predict where whe'll be in the future, which would open up all sorts of ... 'interesting' marketing opportunities for the app maker. Megan doesn't mind the app knowing where she *is*, but doesn't want it to know where she's *going*, and so rejects the second seemingly innocent question. Maybe? {{unsigned ip|108.162.249.205}} | ||
:I agree. It is not about the uncertainty principle, but about predicting future locations with the momentum, or future orientations with the angular speed from the gyroscope. It would NOT violate Heisenberg to measure two (not conjugating) physical parameters with bad accuracy (only the other way round). The argument goes: The phone can measure the orientation quite well despite of the bad compass. So its only option is using the gyroscope and integrating its angular speeds over time. The initial value can come from the GPS, the compass (offset error, if it is really so bad) or from an initialization in the factory (then the gyroscope has to function exceptionally well, but this could be the joke). Sebastian --[[Special:Contributions/108.162.254.56|108.162.254.56]] 14:15, 15 January 2015 (UTC) | :I agree. It is not about the uncertainty principle, but about predicting future locations with the momentum, or future orientations with the angular speed from the gyroscope. It would NOT violate Heisenberg to measure two (not conjugating) physical parameters with bad accuracy (only the other way round). The argument goes: The phone can measure the orientation quite well despite of the bad compass. So its only option is using the gyroscope and integrating its angular speeds over time. The initial value can come from the GPS, the compass (offset error, if it is really so bad) or from an initialization in the factory (then the gyroscope has to function exceptionally well, but this could be the joke). Sebastian --[[Special:Contributions/108.162.254.56|108.162.254.56]] 14:15, 15 January 2015 (UTC) | ||
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