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  • - I think it's time we

    - 我想是時候我們

  • the scientifically challenged and concentrate

    科學挑戰者和集中

  • on one of science's heroes, Tyler Bradt,

    科學界的英雄之一,泰勒-布拉德特。

  • kayaker extraordinaire.

    皮划艇特級大師。

  • He wants to kayak over this, Palouse Falls in Washington.

    他想在華盛頓的帕盧茲瀑布上劃皮艇。

  • Thousands of cubic feet of water pass over this fall

    數千立方英尺的水從這個瀑布上流過。

  • every second and drop 186 feet to the pool below.

    每秒鐘都會下降186英尺到下面的游泳池。

  • To consider kayaking over this, he must either

    要考慮在這上面劃皮划艇,他必須要麼

  • be a few sandwiches short of a picnic,

    還差幾個三明治就可以去野餐了。

  • or a world record breaker.

    或打破世界紀錄的人。

  • We hope.

    我們希望:

  • [music playing]

    [音樂播放]

  • Oh.

    哦。

  • There he is, the new world record

    他在那裡,新的世界紀錄

  • holder of one of the most dangerous stunts

    霸王硬上弓

  • I have ever seen.

    我見過的。

  • Needless to say, even if you do have a 186-foot water feature,

    不用說,就算你真的有186英尺的水景。

  • don't try this at home or anywhere else.

    不要在家裡或其他地方嘗試這個。

  • Falling off a waterfall is the easy part.

    從瀑布上掉下來是很容易的事。

  • But as gravity initially accelerates you down

    但是,由於重力最初加速了你的下降

  • at 32 feet per second per second,

    以每秒32英尺的速度。

  • it's surviving that's the tricky bit.

    它的生存,是棘手的位。

  • Our kayaker must go over the falls at the correct speed

    我們的皮划艇必須以正確的速度越過瀑布。

  • to give gravity just enough time to generate

    給予引力足夠的時間來產生

  • the angular velocity needed to rotate the kayak 90 degrees.

    將皮艇旋轉90度所需的角速度。

  • This angle minimizes hydrodynamic drag,

    這個角度可以使流體動力阻力最小化。

  • so he experiences less impact force

    所以他受到的衝擊力較小

  • and cuts through the water.

    並切開水面。

  • It's also worth noting that a kayak's stability is

    值得注意的是,皮划艇的穩定性在於

  • dependent on keeping the center of mass

    依賴於保持品質中心

  • in line with the center of buoyancy,

    與浮力中心一致。

  • which is in the middle of a submerged volume.

    處於淹沒的體積之中。

  • Otherwise.

    不然的話

  • OK.

    好的

  • Science-taught, let's see if our team of want-to-be record

    理科出身的我們看看我們的團隊是否想創下

  • breakers have learned.

    斷者已經瞭解到。

  • He's practicing the science with a man-made kind of waterfall,

    他在用一種人造的瀑布來實踐科學。

  • but the law of gravity is the same.

    但萬有引力定律是一樣的。

  • The thin layer of water acting as a lubricant

    作為潤滑劑的薄層水

  • combined with the steep angle allows gravity to do its thing.

    再加上陡峭的角度,讓重力發揮其作用。

  • It's not quite the 32 feet per second

    還沒有達到每秒32英尺的速度。

  • per second of a waterfall freefall,

    每秒鐘的瀑布自由落體。

  • but he's only practicing.

    但他只是在練習。

  • On to angular velocity, or in this case, the lack of it.

    說到角速度,或者在這種情況下,沒有角速度。

  • Launching too fast meant he gained very little angular

    發射速度太快,意味著他獲得的角度非常小。

  • velocity, hitting H2O at a terrible angle,

    速度,以可怕的角度撞擊H2O。

  • thereby maximizing hydrodynamic drag.

    從而最大限度地提高流體動力阻力。

  • Which is bad, as it brought him to an almost immediate and very

    這是不好的,因為這給他帶來了一個幾乎是直接的,非常的

  • painful stop.

    痛苦的停止。

  • Waterfall.

    瀑布。

  • Check.

    檢查。

  • Angular velocity.

    角速度。

  • Check.

    檢查。

  • Stability.

    穩定性;

  • Check, ish.

    檢查,是的。

  • It's an upside down check, but technically he still got

    這是一個顛倒的檢查,但技術上他仍然得到了。

  • himself into a stable position.

    自己進入了一個穩定的位置。

  • It's just a shame his center of mass

    只可惜他的品質中心位置

  • is directly below his center of buoyancy,

    是在他浮力中心的正下方。

  • as his head is the thing he uses to breathe.

    因為他的頭是他用來呼吸的東西。

  • Cheering without acknowledging the person

    歡呼,卻不承認這個人

  • that just saved your life.

    這只是救了你的命。

  • Check.

    檢查。

  • Even if our want-to-be record breakers do get to grips

    即使我們想打破紀錄的人也能掌握住。

  • with angular velocity, hydrodynamic drag,

    與角速度、流體動力阻力。

  • and stability, like Tyler did, 186 feet is just too dangerous.

    和穩定性,就像泰勒那樣,186英尺實在是太危險了。

  • Maybe it's better to kayak somewhere safer, like a puddle.

    也許在安全的地方劃皮艇比較好,比如水坑。

- I think it's time we

- 我想是時候我們

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在瀑布上劃皮艇|科學的愚蠢。荒謬的失敗 (Kayaking Over a Waterfall | Science of Stupid: Ridiculous Fails)

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    林宜悉 發佈於 2020 年 10 月 23 日
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