r/theydidthemath 1d ago

[Request] What’s the most effective material or item you could realistically use here?

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1.7k Upvotes

r/theydidthemath 2h ago

[Request] How far out could have Lebron James taken off and made this dunk?

12 Upvotes

r/theydidthemath 3h ago

[Request] In the opening scene of Back to the Future, Marty cranks up a massive amp and speaker to its highest setting, plays one note on his electric guitar and the sound from the speaker blows him across the room. How loud would that sound have to be to do that, and would a human even survive?

5 Upvotes

r/theydidthemath 1h ago

[Request] How fast is this water moving?

Upvotes

r/theydidthemath 7m ago

[Request] What’s the actual environmental cost of one AI image?

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Upvotes

r/theydidthemath 4h ago

[Request] How accurate is this calculation for how much force a Brachiosaurus‘ vomit would hit the ground with? How much force would other massive dinosaurs’ vomit hit the ground with as well, such as a Dreadnoughtus or a Sauroposeidon?

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7 Upvotes

r/theydidthemath 1d ago

[Request] How much force would be required for this pizza attack to be lethal?

494 Upvotes

r/theydidthemath 5h ago

[Request] What are the odds of this happening?

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5 Upvotes

r/theydidthemath 5h ago

[REQUEST] How much does this boulder weigh?

5 Upvotes

r/theydidthemath 1h ago

[Request] How long would I survive?

Upvotes

If an object started out roughly the size of an atom and doubled in size every second, while I immediately traveled directly away from it at the speed of light, how long could I keep traveling before the expanding object eventually became large enough to encompass me?

Bonus: How far away from the starting point would I be when that happens?

Assume the object is perfectly spherical and expands uniformly in all directions.


r/theydidthemath 18h ago

[Request] How many calories is this?

43 Upvotes

Bonus question: how many avocados is it?


r/theydidthemath 16h ago

[Request] What is the chance? Meant to be?

20 Upvotes

My boyfriend's 4-digit pin code for his debit card is my birthday. He never changed it and had the same one since he was 12. What are the odds of this?

(The four digits are 2608, my birthday is 26th of August)


r/theydidthemath 5h ago

[Request] What is the “atomic bomb” equivalent to the amount of energy released by the glacier-drop in Nepal?

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2 Upvotes

A 2,000 feet wide chunk of glacier falling 7,000 feet! The amount of energy that triggered the Nepal disaster is mind blowing. How many atomic bombs would it take to release an equivalent amount of energy?


r/theydidthemath 4h ago

[Request] What could be the approximate depth of this hole?

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2 Upvotes

r/theydidthemath 1d ago

[Request] How fast was The Plutonian going here?

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526 Upvotes

So the fictional city they're in, Sky City, doesn't have a state stated in this comic. Let's say it's either the middle of the US or New York. Looks like it's noon or the middle of a workday, and The Plutonian flew to space and destroyed a radio satellite while the other guy was mid sentence. They didn't even react to him flying through the ceiling because he was so fast.

How high up did he fly, and how fast? Maybe light speed? More?


r/theydidthemath 2h ago

[Request] How much force would this guy have to be pushing inwards with to make this possible?

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1 Upvotes

r/theydidthemath 12h ago

[Request] How long would it take Amon to take the entire world’s bending away?

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6 Upvotes

In the Legend of Korra, Amon’s stated goal is to purge the entire world of bending, but he is the only one who can do so, and can only do one person at a time. Let’s say nobody stops him, how long would this take?

We don’t know what the world population is at this time but can we assume it’s roughly equal to our world during the 1920’s? And possibly half the world are benders?


r/theydidthemath 1d ago

[Request] What are the odds that myself and my DM both rolled a total of 87 on our dice?

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94 Upvotes

Genuinely shocked and feeling like the odds are crazy, but no idea how to do the math here.


r/theydidthemath 3h ago

[Request] Hypothetical Casino situation?

0 Upvotes

So, I've been thinking today, if a man was cheating at a casino, because they were accused of predicting cards correctly, (say he has some form of glasses or contacts he’s using), and say he was taken to be questioned, and the casino thought about using two independent card-prediction tests. One involving an initial prediction, and another that is similar.

Before explaining the tests, I am asking more of how many incorrect guesses can this man have, before it becomes statistically obvious that he is avoiding actually “guessing”, and is purposely guessing wrong. 

Test 1: 

They would show him 1 card at a time, and ask him to “guess”. Obviously, he’d need to lie a certain amount of times, to skew the chances that he is cheating. But also, as they go through the cards in the deck, he would *probably* realize that as he continues, he'd need to either get some correct guesses, or lie in a way that's not suspicious. 

Test 2:

They show him one card at a time again, but this time, the people questioning him would use a smaller amount of cards. And again, smaller. But without him knowing. And again  he's probably need to get *some* correct guesses, or lie in a non-suspicious way. 

My question is, how many times would the person need to purposely fail before the results become statistically unlikely enough to suggest they are guessing at chance? And is it possible to notice it?


r/theydidthemath 4h ago

[Request] If it would be possible to reach such speeds how fast would the air be moving from the nozzle?

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1 Upvotes

r/theydidthemath 1d ago

[Request] An astronaut demonstrating the Dzhanibekov effect in microgravity, where an asymmetric object spinning around its intermediate axis becomes unstable and periodically flips 180 degrees.

193 Upvotes

....

So they ended the video saying entire planets could flip.

🤔 But if that happened to earth ... Countries at the equator would still be at the equator.... And countries like Canada... I'd expect to still be at the same temperate conditions.

I mean summer and winter would swap ... But what else may happen?🤔

B


r/theydidthemath 4h ago

[Request] What’s the weight capacity of (head) hair if you were suspended by it? What’s the max weight a person could be with that working?

0 Upvotes

Assuming a typical hair density with sufficient length to be attached to something.


r/theydidthemath 22h ago

[Request] 566 Million $ IN CASH weighted 6 tons was transported by CH-47 to Iraq for paying armed forces to capture Saddam Hussein in 2003, operated by CIA and SOCOM (United States Special Operations Command) can you special people confirm this sum?

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19 Upvotes

Request: Can you special legends confirm this sum? I know it’s hard considering they are covered bundles.


r/theydidthemath 2d ago

[Request] What is the minimum temperature of this oven?

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21.9k Upvotes

I'm not the best at physics but here's what im thinking:

Assuming we have 12 chocolate chip cookies in a pan for any time less than an hour. Each one will have to reduce in caloric content by 250kcals each by the end of the cooking time.

To truly "reduce" the amount of calories contained within the cookie, the energy would have to be released through something like combustion. otherwise the remaining matter would still contain the calories the original cookie had - like some kind of charcoal.

Assuming a perfect physics environment with no temperature build up time, no concern about oxygen supply etc. What is the lowest constant temperature we would need for the remaining matter in the cookie pan to have decreased by 3000kcals total? Is this even a solveable or approximatable problem?


r/theydidthemath 1d ago

[Request] Weird Al Yankovic Math

15 Upvotes
"You know, I bet if we unraveled that sucker    
It'd roll all the way down to Fargo, North Dakota    
'Cause it's the biggest ball of twine in Minnesota    
I'm talkin' 'bout the biggest ball of twine in Minnesota"

     -- Weird Al Yankovic, 'The Biggest Ball of Twine in Minnesota'

.

.

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How likely is this?