Name: ムチはどうやって音の壁を破るのか？(スローモーション衝撃波の形成) - Smarter Every Day 207 (How does a whip break the sound barrier? (Slow Motion Shockwave formation) - Smarter Every Day 207)
Uploaded: 2021-01-14T08:13:25.000Z
Duration: 11 min 21 s
Description: VoiceTubeの動画で発音を聞きながら英語表現を覚えよう！学べる英語：

- What's up, I'm Destin,
this is Smarter Every Day.

and that crack you hear is this
breaking the sound barrier.

and something's going faster
than the speed of sound

in just a few hundred milliseconds
and over several feet.

OK, now would be an excellent time for me

So April is an engineer
first and foremost.

So April on the internet,
you may have seen her,

Guinness Book of World Records whip stuff,

But what's really interesting
about April, is your brain.

That means air molecules
that are right next

to this fluffy part stay
next to that fluffy part.

- [Destin] And so, it's
pulling that air with it.

a Lagrangian framework,
which centers on here,

or an Eulerian framework that
centers on the overall mesh.

The first thing we did
was create a new tip

for the bull whip and
attach it to the whip

and after that we set
up the camera system.

and this is what took us
so long to coordinate.

Basically, we have a
point-light source right here

and that light is coming
out, it's spreading out,

it's hitting this mirror,
this parabolic mirror,

is it's converging to
this point right here.

You can see there's the
light coming through

And then we've got red
and green gels right there

After everything was set up,
we literally got crackin'.

We learned two major things
in my buddy's garage.

Growing up, I used to
play Castlevania a lot,

so for me, it made sense
that the crack of the whip

would happen at full extension of the whip

'cause that's what you want to
do with the bad guys, right?

You want to keep them as far
away from you as possible.

like it does in Castlevania, the shockwave

would always enter the field
of view before the whip did.

Therefore, it was clear
that the crack was happening

- It actually happens as the whip unrolls,

And in order to visualize
what's happening,

What you're about to see
here are two engineers

and were totally blown away
because the experiment worked

and we're starting to see
things for the first time

The second thing that
we learned in the garage

is there may be a
mechanism that's causing it

to accelerate just before
breaking the sound barrier.

ムチはどうやって音の壁を破るのか？(スローモーション衝撃波の形成) - Smarter Every Day 207 (How does a whip break the sound barrier? (Slow Motion Shockwave formation) - Smarter Every Day 207)

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ムチはどうやって音の壁を破るのか？(スローモーション衝撃波の形成) - Smarter Every Day 207 (How does a whip break the sound barrier? (Slow Motion Shockwave formation) - Smarter Every Day 207)

stuff

perspective

essentially

awesome