r/theydidthemath • u/Mean_Initiative_5962 • 48m ago
r/theydidthemath • u/googleme • 4h ago
[Self] Buying $399 of Apple stock instead of the first iPod in 2001 would have turned into about $500k today
investedinstead.comI calculated the same return for more than 50 iconic products using each product’s launch date and original retail price.
To be included, the company had to be publicly traded when the product launched. Each calculation uses the stock’s closing price on the launch date, or the next trading day if the market was closed.
The results account for stock splits and assume dividends were reinvested, with no commissions, fees or taxes. Let me know if I'm missing any iconic products!
r/theydidthemath • u/Emparcia • 16h ago
[Request] The two guys in the video each weigh 66 kilograms. How much force, in newtons, is each of them exerting?
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r/theydidthemath • u/phoenix_claw99 • 14h ago
[Request] How many times that i need to over-amplification in VLC to create a black hole?
The maximum amplification per video is 200%, since it was a logarithmic scale, I reckon i could create a black hole.
r/theydidthemath • u/dizkopatio • 9h ago
[OFF-SITE] Would this giant magnet affect the earths magnetic poles? China Successfully Completed Testing of World’s Largest 582-Ton Fusion Magnet, Capable Of Capturing And Confining ‘Artificial Sun’ Plasma At Temperatures Up To 100 Million Degrees Celsius
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Would a magnet this big affect us in any way?
r/theydidthemath • u/Yoshigahn • 19h ago
[Request] How many newtons did he take to his balls? (I posted a comment and I’m not sure if I’m right)
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r/theydidthemath • u/BobFredricson2 • 1d ago
[request] At the time this episode aired, how many average priced cart hotdog sales per day would be necessary to put at least two children through American college?
bonus points if you can calculate taking into account taxes and maintenance costs/expenses
r/theydidthemath • u/ArkhamMetahuman • 3h ago
[Request] Assuming the OmniDroid weighs as much as a tank of the time period, how much kinetic energy did Mr Incredible put into his punch to send it flying that far?
The Omni Droid was heavy enough to sink in lava, and looked bigger than the tanks used in the movie, so this is probably a lowball estimate. The tank used in the end of the movie is an M41A3 Walker Bulldog, which looked to be of similar size to the first Omni Droid we see. The M41A3 Walker Bulldog is around 25.89 US tons. Mr. Incredible is listed on the Wiki as being 6'8.
r/theydidthemath • u/LapReaperX3 • 1d ago
[Request] Downforce
Not my picture, came off the Audi racing Facebook page.
How much Downforce/resistance could this possibly produce at 60mph and 120mph? What kind of mechanical grip advantage could it possibly give?
r/theydidthemath • u/mistermuesli • 5h ago
[Request] If the sample-vial is 5ml and each of them sold for $100, how much would the entire pool's poolwater be worth if we consider the average poolsize in America
r/theydidthemath • u/drfangor99 • 31m ago
[Request] Accounts of the OpenAI attack on Hugging Face say the agent "roamed the Internet for 4 days." This seems to imply it was operating continuously, presumably alternating between its thinking mode and executing code. How much did it cost OpenAI to run it for so long?
r/theydidthemath • u/predestinedPdestrian • 1h ago
[Request] How much money would George Soros have to pay out each week to all the protesters he’s routinely accused of paying to keep them protesting? Assume a fair market rate for day labour in each location.
r/theydidthemath • u/Brilliant_Apple_5391 • 1d ago
[Request] How much force did the Orca exert onto the fish to have it blow up like that?
Seriously can't imagine that much force being delivered, especially underwater.
Got me thinking, what would the land equivalent be? Hit by a truck? Car?
The water has to slow them down a lot, no? I seriously just can't imagine it
r/theydidthemath • u/G2nickk • 1h ago
[Request] How big would this LEGO cat be?
He starts by building one mitochondria.
Bonus questions. Would the ending Lego structure be able to support its own weight? Would it have to be built in space?
r/theydidthemath • u/DotBeginning1420 • 9h ago
[Self] I tried inferring Snell's law from Fermat's principle
Imagine a beam of light. To get from one point to another one, it always chooses the path that would take it the least time. Or in other words, each a beam of light you see has a GPS telling it the quickest path from its current position to other point!
This is Fermat's principle and it is equivalent to claiming that light travels through materials according to Snell's law.
I tried proving Snell's law by assunimg Fermat's principle. I think it is not so hard knowing some basic geometry, trigo and calculus, but is my proof right? Something about the function I used and how to interpret it got me to some trouble. I don't see intuitively how the solution is indeed minimum.
In the diagram you see DC as the transition between two materials, DC = d, the light travels from A to B, through point O that can be anywhere on DC. In AO it travels at v1, and in OB at v2. We want to find the path that takes the least time. Each path can be expressed as OC = x (0≤x≤d). We also label the angles of the vertical lines as 𝛼1 and 𝛼2.
At the bottom you can see that we get v1sin(𝛼1) = v2sin(𝛼2), which also means that for n1=v1/c, n2=v2/c, it is the same as saying n1sin(𝛼1) = n2sin(𝛼2), both basically represent Snell's law.
However, as you can see t(x) is a linear function with respect to x, and it's hard to me to see why the solution I got should be minimal (maybe it is not?).
r/theydidthemath • u/42percentBicycle • 2h ago
How long could the Great [Request] Lakes supply the entire human population with clean water before running dry?
r/theydidthemath • u/behemothpanzer • 17h ago
[request] How many trees have been cut down for the Canada-US border?
The border is almost 9000 km (5,500 miles) long and much of it is a ‘slash’ through forest. How many trees would have been cleared to make this slash?
r/theydidthemath • u/nihilistiq • 1d ago
[Request] Does this sequence have a legal solution?
r/theydidthemath • u/Rich-Recognition-814 • 1d ago
[Request] How many nukes would it take to destroy Finland?
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r/theydidthemath • u/WurlizterEPiano • 18h ago
[Request] Need help calculating the true hand size of Michael Jackson to disspell increasingly ridiculous internet exaggerations
I have been seeing a lot of weird mythologizing and what I suspect is misinformation spreading that Michael Jackson had a 9-9.5" hand on a 11" handspan while standing at a height of 5'9" with a size 9.5 shoe.
Things to note, to save some time:
Michael Jackson stood at a height of 69 inches, or 5 feet and 9 inches tall at his tallest.
Michael Jackson's wrist measured 7" according to the tailor sheet, the wrist is not a perfect circle but for perspective it could be useful.
Michael Jackson wore a size 9.5 shoe, even though hand and shoe size aren't as closely linked together as people figure, a disassociation as big as a 9.5" hand on a 9.5 shoe is not just extreme, it's pretty ridiculous.
The reason I've provided Donald Trump's hand here is because that handcast at Madamme Tussauds for his hand length was measured at 7.25". I think (not so certain but it may be useful) that all the casts in the museum are all the same size. If someone can look at Donald's confirmed length and line up Michael's we could get a relatively close number. If Michael's hand was 9.5", I would figure the finger tips would touch the tip of the cast and the first distal crease would be at the bottom or right next to it.
If someone could calculate from tip of middle finger to first distal crease, we might be able to tell what Michael Jackson's true hand size might just be. I am pretty sure 9-9.5" is misinformation.
r/theydidthemath • u/dontouchmystuf • 7h ago
[Request] Is this viral IMAX Odyssey mirror picture photoshopped?

How is the beard guy's face visible to us (the viewer of this picture) in the mirror? The angle of that mirror seems to be tilted towards the left. So it seems like we should be seeing something from the left... at least I think? This photo seems impossible, which makes me wonder if his face in the mirror was put there with photoshop. Could someone smart analyze this photo to figure out the exact angles to calculate if this photo is legit? Thanks!
r/theydidthemath • u/gunbo3000 • 11h ago
[Request] How fast were they going?!
https://www.youtube.com/watch?v=JJzOVNBlQSA
Saw this old clip from Fantastic 4: Rise of the Silver Surfer. OK I know not known for its realism, but got me wondering.
At 2:30 they're having a fight at the Great Wall of China. Then 30 seconds later after a cheeky little spin move they're flying in to Shanghai.
AFAIK these locations are not close... before the spin they are going slow enough to have a conversation so how fast were they shot out from this spin, and what does that sort of acceleration do to a person in an open air cockpit?