How To Solve Amazon's Hanging Cable Interview Question

[@sumtensor]

By translating the coordinate system so that the rope’s lowest point coincides with the origin, the poles, initially 50m tall with the rope 10m above the ground, become points at y=40. In this adjusted frame, the rope must descend from y=40 to y=0 and then ascend back to y=40, totaling a vertical traversal of 80 units. Since the rope length is exactly 80, this vertical journey alone consumes its entire length, leaving no room for any horizontal displacement. So the distance between the poles must be 0.

[@InvaderMixo]

I have a math degree, and I never encountered the derivation of a catenary. Sad me. Seems like an extreme thing to bring up in a "job interview".

[@Erik_The_Viking]

Questions like these are more of the "stump the chump" variety to make the interviewer feel superior to the candidate. Nothing more.

[@wargreymon2024]

it is a famous problem

[@Dom-kp6ur]

It’s more of a physics thing

[@Zxykary]

@@wargreymon2024 "Famous"

[@kmc6413]

“This shitty video by Fresh ToadWalker” 🤣

[@Erik_The_Viking]

That was savage!

[@vitowidjojo7038]

Is there even a reason for him to roast him... Or is it just for fun?

[@mkt6890]

​@@vitowidjojo7038 yes

[@user-yt198]

​ @vitowidjojo7038 He wants the other mathematician reply him and become more visible in YT. So he is click baiting himself.

[@redpepper74]

@@vitowidjojo7038he makes a lot of videos on viral “math problems” that don’t really have a lot of substance

[@roygalaasen]

Fresh Toadwalker?? I thought you buried the hatchet years ago 😂 Edit: Black Pen Red Pen next?

[@duggydo]

I want to see Fresh ToadWalker vs Papa Flammy in a Math & Boxing match.

[@taterpun6211]

The equation after changing coordinates satisfies y'' = Cy for some C>0. This physically makes sense, as the second derivative tells us how much the function is "curving"; a hanging string has more height when bent.

[@iqtrainer]

This is the regular one. Interesting one. Dr PK posed an upgraded amazon cable hanging question too

[@lucabayne2874]

Great advent calendar I’m really loving how content from one day flows into next nicely

[@PapaFlammy69]

[@Golth1502]

I had to prove it a few months ago to some friends, they said it had to be 0 and not 40 something. Next time I will sent them your video

[@tangsolaris9533]

The 20m parameter changes everything

[@neilgerace355]

2:50 or squarecular maybe

[@mr.inhuman7932]

Wow that was actually very fun! I liked the explanations. I didn't feel left behind which os really nice!

[@abhaykumarsingh7081]

Hmmm I wonder if one can do this using variational calculus? Was doing the minimum area of revolution problem and the solution was similar so I am guessing it’s close to that?

[@firstnameIastname]

Nothing hurts more than when someone says "no brainer, right?” then proceeds to explain something I have no ability to grasp or follow along with whatsoever I love science & technology & physics & engineering but its so hard when i dont get even basic algebra, let alone when the calc & trig start getting thrown around. I just read "Universal" by Brian Cox & Jeff Forshaw, & it was very similar, lots of equations, symbols, terminology that seemed 10 years ahead of my understanding, but presented in a way that made it seem like it should be obvious. The book was good with a few other exceptions. Im just an idiot dropout though, good video 😎

[@MargoTheNerd]

I had similar issues due to awful teachers. Fortunately in this day and age you can revisit basics without being made fun of or having to use books directed at children, with many resources adding visual aspects that helped me understand concepts I had no chance of grasping otherwise. Perhaps your learning style needs a different approach than one you were provided. Learning basics can be fun and while full understanding requires some tedious repetition you can now do that in much more fun and interactive ways. There's great resources - from Khan Academy, Chad's Prep (organized chemistry and basic physics playlists), Michael van Biezen, Organic Chemistry Tutor (guy has videos on almost any science subject including calculus), 2Blue1Brown (beautiful introduction to calculus and linear algebra, amazing channel for visual learners), Three Twentysix (Fundamental chemistry concepts from start without being dumbed down) and Profesor Dave Explains, through Brilliant, to open source lectures (I recommend Walter Lewin's Physics 8.01, 8.02, 8.03 that contain lovely demonstrations).

[@symphonyofsolidarity]

Not me thinking there's actually another channel named Fresh ToadWalker 😭

[@PapaFlammy69]

xD

[@sepro5135]

I solved the same problem, assuming the cable is a parabola, pretty neat and doable with some calculus knowledge and works out pretty good. Only for the last expression I had to numerically approximate. My solution was roughly 56.3 m. Feel welcome to share if you got the same or a different solution!

[@YassFuentes]

Such a funny exercise! Thanks for share

[@patolorde]

11:00 😂😂

[@adamjones7891]

Father Flame, thank you.

[@pseudolullus]

I love some minimizing curves/surfaces, man

[@danielgrizzlus3950]

Why cosh of x?

[@experimentingalgorithm1546]

It's a parabolic curve that's why

[@anonymoushere7786]

Hyperbolic functions I guess

[@carultch]

@@experimentingalgorithm1546 It's not a parabolic curve.

[@TranquilSeaOfMath]

2:42 Video_1 Video_2

[@noreaction1]

Can you make another video where we have to solve for the length of rope where we know what height are the posts and how far are the posts if we must make the low point a given height above ground?

[@pedrogarcia8706]

Is there some beef between this guy and presh that i didn't know about because that seemed really personal and brutal

[@PapaFlammy69]

nah

[@user-yt198]

No, he is click baiting himself.

[@tankytrash1281]

I keep getting clickbaited by those kinds of no brainers.

[@PapaFlammy69]

Have you watched the whole thing doe?

[@tankytrash1281]

@@PapaFlammy69 nah clicked watched the first 20 seconds just to confirm im not going crazy

[@joelklein3501]

NO WAY is that sinh from Arcane???

[@wrog268]

cosh(x)

[@carultch]

Oh my cosh, finding the arc length of a catenary is such a sinch.

[@justkarl2922]

always kinda very sussy when the maths guy write decimals next to equal signs👀

[@Founder2721]

Fresh toad walker gonna hide in ur closet bro

[@apppples]

i always forget the name of catenary curves.. i just remember hanging curve something something cosh. why is that word so hard to remember

[@sylvain75]

Britney Spears as a guest on this KZbin channel !

[@OUSSA]

D=0

[@chrisglosser7318]

You’re kidding, right?

[@PapaFlammy69]

what?

[@codeforcespractice]

DDD day 5 huh

[@user-yt198]

To be fair, Presh Talwalkar emphasizes that only 10m part of the question was asked in an Amazon interview and he gives reference where he found it. So the no-brainer case. Maybe Amazon was checking if the candidate could realize that such a deep math question would not be asked and he should be just using his logic? For 20m case, he says he looked up the formula from a book which he also gives the details for. Your mocking about a fellow mathematician's name is pure ad hominem and childish. People (or probably 99.9% of them) do not have the liberty to choose their names.

[@duggydo]

You are talking about someone different. Fresh ToadWalker is not a mathematician. Nor is his hominem completely pure ad.

[@harat-xwb]

@@duggydo My nephew stopped mocking people with their names when he graduated from primary school. How old are you?

[@duggydo]

@@harat-xwb I'm 69, soon to be 420 honey. I've got a lotta money, and my jokes are funny. It's easy to be mad, but you will end up sad. If you're happy, your life won't be bad.

[@harat-xwb]

@@duggydo Hahaha. You must be alter ego of Fafa Plammy.

[@user-yt198]

@@duggydo Not mathematician? Presh Talwalkar was graduated from mathematics department of Stanford University, not from a German university that nobody knows.

[@georgelaing2578]

What a mess!!!😑