g'day my smart mates my name is dylan dance i'm a physicist from the land down under
grab a coffee grab a chair grab a vegemite sandwich
whatever you want to grab let's talk some natural philosophy i came across
this anime because it kind of went viral when a question from the anime was on a physics exam
fun little fact about the explosive physics of
pooping penguins they can actually shoot their poo over four feet
why i don't know yeah next time you're at an aquarium or you're just around penguins keep
your distance i think they did this research specifically for that reason believe it or not
they wanted to know you know how to make penguin enclosures and
how close people can get because yeah so naturally they brought in the big guns the physicists to
explain the explosive physics of pooping penguins you won't find this sort of wisdom and hot tips
or explosive content on dr mike's channel so make sure you subscribe
i like what they've done here with the broken bones because he's used so much force that
they've just shattered so we can talk about this and the physics of breaking bones because
they're not as easy to break as you might think ounce for ounce bone is actually stronger than
steel and one cubic inch of bone can withstand the weight of five standard pickup trucks give
or take a few pounds if you're looking for the specifics to snap a piece of your skeleton
it takes about 4 000 newtons to break the average human femur don't run out and start
applying pressure to femurs and then come complain to me when things start cracking
a lot depends on the bone itself the position of the bone in the body and the angle of attack
if you've ever tried the experiment yourself you probably know that you can't walk through walls
but did you know there's actually a non-zero probability that you can now it's so incredibly
small that it is probably never going to happen but it is non-zero but particles actually can
thanks to something called quantum tunneling maybe one day we'll actually be able to quantum tunnel
humans now you might think dylan you're crazy that's just not gonna happen well guess what
there's already devices you're using right now that embrace this we've already created
semiconductors where electrons quantum tunnel through non-conducting material there's actually
some types of magnetic hard drives out there already that rely on quantum tunneling to read
out data and then there's the nobel prize-winning scanning electron microscope which relies on
electrons to tunnel through a tiny finger-like probe and a conducting surface there are all sorts
of experiments going on around the world right now where physicists are trying to tunnel macroscopic
objects quantum tunneling and mechanical systems are the kind of holy grail that people are
looking for right now and there are all sorts of experiments around the world going on right now
so if that sounds cool to you you should get into physics so why can't you use quantum tunneling to
walk through walls yet well quantum calculations show that you could wait the age of the universe
and still not see someone walk through a wall but there is still a non-zero probability of doing so
that's pretty much just like trying to do physics
maybe we should talk about lasers if you didn't know laser is actually an acronym
for light amplification by stimulated emission of radiation so a laser actually works thanks to
quantum physics if you pump extra energy into a material it often releases that extra energy as
photons those photons then get absorbed by nearby atoms which then release more photons and this
creates a cascade and that results in a beam of coherent light there's actually a form of lasers
called tweezers which uses two beams of light to squeeze and manipulate objects as small as
a single atom i wouldn't expect laser chopsticks anytime soon though unless your sushi roll is 100
nanometers or smaller so the problem i have with this scene are that people are so easily able to
dodge this laser which is traveling at the speed of light which is 300 000 kilometers per second
you see this in all animes and tv shows but i really don't like it because it makes no sense
so let's talk about this girl negating gravity and throwing this ball indefinitely now if you know at
least a little bit of physics you might think hang on hang on my boy einstein told me that gravity
isn't actually a force it's just the curvature of space-time and so you know turning this ball's
gravity off doesn't really make a lot of sense in that context but what you have to realize is that
a lot of people in the physics community believe believe we don't have any proof of this yet but we
think that space time is doomed so einstein's general theory of relativity and of gravity
we think it's going to turn out to be a classical approximation of what gravity and space-time are
so what quantum field theory suggests which is our current best theory of nature incredible
theory it's what the standard model of particle physics is a quantum field theory in principle
gr should arise from a quantum theory as well this means that there is a smallest possible
excitation of the gravitational field when i say excitation i mean a particle because in a quantum
field theories you have fields everywhere and when you excite that field what i'm really meaning is
you're creating a particle essentially so this gravitational field when you excite it when you
perturb it you will be creating a graviton so to rehash the theory of space-time curvature gr
should turn out to be the classical limit of the quantum field theory which describes the
motion of gravitons so relating this back to the anime it may very well turn out that you can do
something similar to this where you can turn off something's gravity by manipulating the gravitons
pretty wild or even the higgs field but we've talked about the higgs field and the god particle
before so we won't go down that rabbit hole again have you ever asked yourself why does it
take humans and elephants the same amount of time to poop let's talk about the physics of poop we
only discussed the highest quality content on this channel i remember reading this piece of research
a while back and a team of physicists basically worked with a zoo to look at different animals
different sizes of animals to basically create a mathematic mathematical model of the duration
of pooping and they learned something pretty interesting the bigger the animal
the quicker the pooping which is kind of strange isn't it elephants pooped quite a lot quicker
than humans or other in between sized animals they actually made some interesting medical discoveries
with this research as well like what determines the shape of poop and it's a rectum and uh large
intestine if you were wondering so this research actually had some practical benefits it actually
helped them design an astronaut suit basically a big diaper for astronauts that want to stay in a
spacesuit for seven days and it essentially helped him you know pull the feces away from the skin
yeah i think we'll we'll stop talking about that we have these animals in australia called warm
bats they're basically like miniature little bears they're these tiny well they're not tiny they're
like this and they're really fat and small and they're you always see them when you're driving
out at night in the bush in australia they're everywhere and they're so much fun and they're
really friendly you can try don't chase them you shouldn't chase them but something really fun
about them is uh they burrow into the ground right and they sleep in burrows underground not too deep
and they sleep headfirst and because of this they actually poop cubes their poop
are cubes i think that's awesome because think about it why would they be pooping cubes
it's because they can poop in their burrow and it doesn't roll back into them genius
pokemon
it's a bit like physicists it's a bit of a facade me talking about all this stuff
because at the end of the day you know what it is is a lot of coding and math
so if you're going into physics be prepared for a whole lot of math it's all of it is math
and then when you get into doing actual physics it's a whole lot of programming and coding
which you're just not prepared for either so but you know it's fun
so you might have noticed today that i'm actually standing up what i've realized
is that if i'm gonna do this job if i'm gonna watch these shows i need to have the agility
to quickly react when i see a bit of incorrect physics
that's what this job requires you can expect a lot more random content like this so please
subscribe if you enjoyed that apply some time derivative of momentum onto that subscribe
button on that like button help me push this video out to other people and let's change
people's perceptions of things like physics and math and show them
you know it can be cool i'll see you guys next time catch you later