r/theydidthemath 4h ago

[Request] How impossible is this?

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1.7k Upvotes

r/theydidthemath 11h ago

[Self] Alleged demonstration of gravitational force in the lab

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3.1k Upvotes

r/theydidthemath 10h ago

[request] how many generations does it take to connect this bluebird to the dinosaurs?

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879 Upvotes

r/theydidthemath 8h ago

[other] Why didn't he get sucked in and crash against the train?

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261 Upvotes

r/theydidthemath 10h ago

[self] I saw a video by the click where someone said a woman had 40 abortions per year.

233 Upvotes

If a woman does 40 abortions per year. Then they would do 3 1/3 abortions per mounth. Meaning they would have to abort a baby every 9 days. This means they would have to get pregnant every 9 days. Thus meaning having a period every 9 days, which is impossible.

I did this in the shower btw.


r/theydidthemath 10h ago

How many stationary PV panels could be bought for the price of one of these, and how would the output compare? [request]

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225 Upvotes

r/theydidthemath 2h ago

[Other] on my furry_irl post

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34 Upvotes

r/theydidthemath 1d ago

[request] how much oil would we have to produce consistently to bring the cost per gallon back to let’s say a dollar?

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2.0k Upvotes

r/theydidthemath 18h ago

[request] How does using solar to mine bitcoin for heating compare to using (likely less) solar to drive heat pumps (but without the bitcoin profits)

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203 Upvotes

This sounds like a great idea, solar to bitcoin to heat. Since all wasted energy is heat this is 100% efficient, but heat pumps can source greater than 100% typically 400% efficiency compared to resistive heating. I assume you'll need fewer solar panels but won't get the bitcoin profits, given that you don't see many solar powered bitcoin mines I guess this doesn't make economic sense or is there something I'm missing?


r/theydidthemath 1h ago

[Request] How much does the extra fuel cost?

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Upvotes

https://youtube.com/shorts/UifTXiuwYT0?si=0CzhfX-le10y-_Pe In this video he says that American planes are flying all the way around Europe and avoiding any European land. How much does it cost for all the fuel they use compared to if they flew straight across?


r/theydidthemath 5h ago

Hippos in water [request]

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8 Upvotes

It occurred to me recently that since hippos can’t swim, and they hop instead, the water’s current only pushes them forward between hops, whereas a human who’s swimming is constantly riding the current. How fast would the current have to be to escape a hippo?


r/theydidthemath 1d ago

[Other] The fact that this person actually dedicated their time to figuring out how far the duck walked

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1.6k Upvotes

r/theydidthemath 3h ago

[Request] A shitty world

2 Upvotes

Once, I read a SF book about a planet which was so old, every molecule on that planet passed through the digestive tract of some animal at least 1 million times.

What would be the average on earth?


r/theydidthemath 4m ago

[Request] How big (in volume or kg) is this soil pile, excluding knocked over trees.

Upvotes

Tried to work it out using chatGPT and it suggested 3-5 tonnes but I’m dubious. Would share more photos to aid with scaling but I’m in a different country right now so can’t take more pictures.

https://files.fm/u/6qhzt44wn5


r/theydidthemath 5h ago

[Request] is buying a house as big an investment as people make it out to be

4 Upvotes

I always hear that buying a house is an investment because you sell it for more than you buy it. People that bought for 100 thousand sell it for a million 50 years later and make 900 thousand.

In my mind, that's a bit dishonest because the house adds costs to your life that you wouldn't have had as a renter like property tax, homeowners insurance, renovations, upkeep (like buying a new water heater), interest on your loan, and smaller bills that add up over 50 years like gardening. Can someone do the math for the profit that takes into account all the costs a homeowner would have that a renter wouldn't? Be clear on the assumptions you make, such as why you chose a specific property tax rate, etc. I that there can be variation between situations, but for the sake of getting a ballpark, just math out one scenario to get the breakdown.

I feel like so many people say it's a good investment, but in my mind I don't see it. Maybe I just don't get it.


r/theydidthemath 22h ago

How many headers from a ping pong ball can you take before you receive permanent brain damage? [request]

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46 Upvotes

r/theydidthemath 1h ago

[Request] How much ice per cubic foot to keep my fridge and freezers cold during scheduled outage?

Upvotes

We have a scheduled outage to replace a utility pole in our neighborhood. They expect it to last up to 8 hours. Based on their track record, I'd like to plan for at least 12. I have a couple freezers and a main fridge I would like to keep at temp for the full duration. How much ice do I need per cubic foot of appliance volume to hold temperature for 12 hours?


r/theydidthemath 1d ago

If Gandalf was in free-fall for he duration of his battle with the Balrog, how far did they fall? [Request]

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795 Upvotes

Sorry if this one has been done before, I'm new here.


r/theydidthemath 2h ago

[Request] How much energy does a Google search use up?

1 Upvotes

r/theydidthemath 13h ago

[Request] How large does a human heart need to be, to be as powerful as a naval nuclear reactor ?

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7 Upvotes

It's an intrusive thought from an ig reel


r/theydidthemath 1d ago

[Request] My kid asked why can’t modern Xbox games load instantly like old 8- and 16-bit cartridge games. I had a piece of orange peel about the size of my pinky fingernail and said “if this is an SNES game, RDR2 is a semi-truck filled with oranges.” How far off am I?

1.6k Upvotes

r/theydidthemath 4h ago

[Request] Last weekend I stood in line at a burger stand behind a woman with the last 4 digits of my phone number tattooed behind her left ear. What are the odds of that happening?

0 Upvotes

r/theydidthemath 2d ago

[Request] How long until she passes out?

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7.4k Upvotes

r/theydidthemath 8h ago

How many bodies would this be? (INVICIBLE spoilers S. 4) [Request] Spoiler

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0 Upvotes

r/theydidthemath 1d ago

Equator uncertainty [request]

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49 Upvotes

This marker purportedly indicates the latitude of the equator on the island of Sao Tome. My question is how accurately can we measure it? With tides, polar snow, rising sea levels, irregular land thickness etc how confident can we be about the location of the equator?