1,000 Birds In A Truck Riddle

published on July 13, 2020

Vsauce Kevin here imagine that a guytransporting thousands of birds in anenclosed truck stopped before crossingan old dangerous bridge his avian cargomakes the truck too heavy to safelycross so how could he make it lighterthe birds what if he banged on the side

Of the truck scared the birds inside andcaused them to fly around if they're inthe air they'll weigh nothing and he cansafely cross the bridge right before wediscuss those Angry Birds I'd like tothank Angry Birds too and Rovio

Entertainment for inspiring andsponsoring this videoit's amazing how captivated we are byflinging Birds and tumbling towerphysics millions of people alter theirBirds trajectory to compensate for the

Kinetic energy of air blown by fans toperfectly knock out B block holding upthe precarious structure download theupgraded edition of the classic game byclicking the link belowplay the map compete with others online

And power up your Birds thanks again tothem for supporting Vsauce to have funplaying Angry Birds too but now we haveto get back to our troubled truck driverthese scared angry birds are flyinginside his truck as he slowly drives

Over the bridge here we go oh don'tworry don't worry I'm sure the truckdriver and the birds are fine the bridgenot doing quite as well why didn't hisplan work because he didn't account forthe unseen physics of bird flight

Excuse me Bridge to fly a bird has togenerate enough lift and thrust tocounteract drag and it's body weight wecan calculate that by making weight Wwhich equals 038 constant value relatedto the angle of attack which is the

Angle of its wings relative to the airusually 6 degrees or so multiplied bythe airspeed V times the mass flow ofair which is airspeedtime's air density D multiplied by swhich is the surface area of their wing

And you know what look calculationsaside I like to think of this riddle asthousands of uncaged Birds just freakingout and flapping their wings inside thistrucksome birds are generating a downward

Force on the air to create the thrustand lift have gets them up off the truckbed some are flying horizontally andthey're using thrust and lift to stay inthe air and others get in the air andfreefall which reduces the overall load

In the truck by their full bird weightthe important part is that even thoughthe truck driver can't see it air is afluid and these birds are throwingphysical forces around in everydirection as they move within that fluid

Since he's got thousands of birds in aclosed truck those forces are going tobalance out so that the trucks weight isbasically the same with the birds flyingaround as it was with them just sittingthere it's easy to understand his logic

Though thousands of birds are heavy getthem up in the air and they won't be butseeing the unseen like the forces offlight requires a high degree ofabstract thinking and that's a prettynew concept not like last year new but

Like 50,000 years ago new when Homosapiens separated itself from otherhominins by entering the era ofbehavioural modernity abstract thinkingis really hard to dowe're thousands of years past the Stone

Age and we still encounter everydayparadoxes because we often miss what wecan't see the truck drivers eyescouldn't show him all the complexitiesof bird flight physics I can't see timethat's not a weird thing to admit

Becausenobody can sure we can look at a clockor notice the effects of time on thingslike the changing of seasons but wecan't actually see the dimension of timewe see representations of time and even

Those can be deceiving here's an exampleyou hate your evil identical twin youwant him out of your life at least for alittle while so you put him on a ship tothe nearest planetary system while youstay on earth

My evil identical twin is named Bevanthat short for it's her for bad KevinAlpha Centauri is about 44 light-yearsaway if I put Bevan on a ship called Vspace 2 and sent him off at say 08 Cthat's 80% of this speed of light he'll

Get to Alpha Centauri in 55 years ifBevan plants a flag and then flies backhe would return in 11 years for me 11Kevin years distance and also time seemsto work differently for Bevan from hispoint of view traveling at point eight

Times the speed of light makes Bevansdistance contract to just two point sixfour light-years which means it takeshim just three point three years eachway to Bevan his trip only took sixpoint six years my 11 years of freedom

From Bevan were only six point six yearsof banishment to him which means myidentical twin is now four point fouryears younger than methat unseen element of time just wasn'tthe same for us since we can't actually

Travel at lumenal speeds yet we have toexplore special relativity in the laband in our minds and sometimes that's agood thing because seeing can deceive usit's why I burnt my burgerthe higher the heat the better right I

Could see the outside of the burgercooking fast in the pan but that char isactually making heat conductivity to thecenter happen less smoothly instead ofengaging the mired reaction thatcombines sugars and amino acids to bring

Out the flavors higher heat justscorches the outside without cooking thecenter evenly it tastes bad and theinside is still pretty raw we can getfood poisoning because our eyes aren'tvery good at thermodynamics but what if

You're the hamburger and you want tostay uncooked metal even though metalconducts heat to cook things likeburgers metal also protects againstunseen heat thermal energy that comes inthe form of infrared radiation exists

Just below red on the visible spectrumof light and infusing protective gearwith reflective metal repels infraredradiation like this aluminized emergencyblanket which reflects about 95 percentof radiated heat NASA invented

Metallized polyethylene terephthalatefor space but I use it to look nice whenit comes to birds in a truck evil twinstraveling the cosmos or cooking burgerswhat you see is not always what you gethere I'll draw two straight lines there

Now just count the lines onetothreeeven what appears to be the simplestvisible truth can be filled withcomplexity that we can only see when we

Admit that we can and as always thanksfor watchinghere we go didn't really collapse asmuch as the daughters going to here wegoit's still they wanted it to hello

Welcome back if you want to watch moreVsauce 2 videos just click over thereand if you're not subscribe to Vsauce 2then I suggest you give that a shot youjust click the thing that says subscribeit's like over there and it's like a

Free wonderful gift for your computerand your YouTube account and your mindand really the mind is the greatest giftbye

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