saigyouji yuyuko, rumia, kawashiro nitori, kamishirasawa keine, and morichika rinnosuke (touhou) drawn by nanaroku_(fortress76)

Artist's commentary

  • Original
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    東方4コマ　幻想郷大運動会～二百由旬の一閃～＃０３１

    にとりが可愛くない不具合を改善しました。ノw')ノ

    前回幽々子が怒ってたのはこういうことで。
    「今日は妖夢、体調が悪いのよ～」とフォローしました。
    光に近い速さで走る人間のタイムを測る事なんて普通誰もやった事ないので場は騒然としましたが、にとりが収めてくれました。
    にとりが言ってることは、パチュリーだけはわかった様子。そのうちなんとかなるかもしれません。

    そして、たぶんストップウォッチでもなんとか亜光速で移動する物体のタイムは測れるんじゃね？　・・・ゴールラインを超えるのを捉えることが出来さえすれば。　とか思い始めました。
    できるのかな。勉強してみよう。→　直後思いついてしまいました。　→　でも普通これって無理じゃねって思った。うーん。

    でもとりあえず、この場に居た彼らは出来ないと言う判断をしたということで。

    アンケートは、「亜光速の移動物体をストップウォッチで計測可能？」大変興味深い議題です。

    次の話→pixiv #9282157 »
    前回→pixiv #9234713 »
    すべての発端の一章冒頭→pixiv #8176402 »　二章冒頭→pixiv #8425616 »

  • Comments
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    zipa24
    [hidden]

    AKRA said:
    I Thought electrons move at 0.97c.

    Electrons themselves move usually rather slowly on wires (m/s is a handy unit). Electricity (and electric signals) on the other hand can be rather fast but that depends on the cabling. That 0.97c is probably near maximum but it can be less than a half of that, too.

    ...not that this has anything to do with the manga...

    1 Reply
    unicode
    [hidden]

    Electromagnetic waves propagate at the speed of light, but electronics we use transmit information by varying the amplitude or the frequency of the waves, and both of these change at units of nanoseconds or worse.

    Not that I expect anyone to understand what I said...

    1 Reply
    Justy
    [hidden]

    unicode said:
    Electromagnetic waves propagate at the speed of light, but electronics we use transmit information by varying the amplitude or the frequency of the waves, and both of these change at units of nanoseconds or worse.

    Not that I expect anyone to understand what I said...

    Anyone who passed a high school should.

    2 Reply
    GreenDrag
    [hidden]

    MMaestro said:
    Or simply high school physics.

    And also remember it...

    Anyway... "need a time-mpilfying device"... Nitori... your genius lasts only to this extent?
    Make a device capable of measuring the time accurately.
    Calculate the time the calculations take place in the measuring device.
    Subtract the time it takes to calculate the exact time from the time that was measured.
    ->Exact time...

    Subtraction or time-ampilifying... I hope we all understand which one WUOLD be the simpler... But this is Gensokyo. This is a Manga. And in defies logic on the most basic levels. 'Nuff said!

    0 Reply
    FRien
    [hidden]

    unicode said:
    Electromagnetic waves propagate at the speed of light, but electronics we use transmit information by varying the amplitude or the frequency of the waves, and both of these change at units of nanoseconds or worse.

    Not that I expect anyone to understand what I said...

    That's quite simple.

    0 Reply
    Aphid
    [hidden]

    Actually subtraction alone won't do. The simple fact is that the 'uncertainty' of your measurement becomes too large. Every physical measurement has some degree of imperfection, some degree of imprecision. You cannot precisely measure an object's time and space, see Heisenberg's Principle on that.

    E.g. the stopwatch may post 0:00:0317 +/- 0:00:0002. If the stopwatch's delay is 0:00:0316 you get 1 ms +/- 2 ms, a worthless measurement.

    What you need is indeed some way of measuring more accurately, an atom clock, or in this case perhaps even a Quantum Clock, as we're talking about near-light speed objects. One metre is covered in less than a nanosecond! Which does indeed involve relativistic physics, modifying properties of light, and some complicated optics.

    As well as having a near-perfect vacuum tube to send the light signal through, perturbations by air molecules would cause another unacceptably large error margin. And a lot of other laboratory-grade equipment.

    TLDR: Like Nitori said: This is harder than it seems.

    3 Reply