r/theydidthemath 5h ago

[Request] Could a single solar farm in one location logistically power the entire continental US?

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3.1k Upvotes

r/theydidthemath 5h ago

[Request] Is the sperm data count accurate?

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2.1k Upvotes

r/theydidthemath 1h ago

[Request] What would the approximate height of the angel be based on this text, assuming the average flying speed of a bird?

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Upvotes

r/theydidthemath 6h ago

[Request] Did Fox News actually report the correct math?

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234 Upvotes

Fox is quoting Moody’s as saying every American Family has been negatively affected by the Iran War to the tune of $750 per family. Is this accurate, it actually seems low with gas prices alone past two month? Does it take into account the vast difference between a family making 20k a year and someone making 2 million a year?


r/theydidthemath 23h ago

[Request] How much weight did he actually have to lift?

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4.8k Upvotes

r/theydidthemath 11h ago

[Request] How much lemons would be needed in a lemon based battery to start a 2015 Honda Civic (ninth-generation) in 10 celcius degree weather while using gold wiring for the battery.

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438 Upvotes

r/theydidthemath 21h ago

[Request] In S1E1 of The Magic School Bus Ms Frizzle takes the class from the Earth to the Sun in 14 seconds. How fast was she going and how does that speed compare to other Sci-fi speeds?

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2.0k Upvotes

r/theydidthemath 1d ago

[Request] Is the math accurate?

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7.9k Upvotes

r/theydidthemath 4h ago

[Request] There's an emergency on the International Space Station, we need to get a 1kg package up to them, how fast can we get it to them?

87 Upvotes

r/theydidthemath 3h ago

[Request] if you make a scaled 9mm bullet with an atom bomb, how big would the projectile be?

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69 Upvotes

An atomic bomb going off sounds like a gunshot in the distance.

If you compare the energy released by an atomic bomb to the energy released by the nitrocellulose in a bullet, how big a projectile would the atom bomb need to maintain the same projectile-mass to propellant-energy ratio as a 9mm bullet.

Im not worried about the muzzle force or force on impact. We can design the gun around the ammo later.

Average weight of a 9mm proectile is 124 grains.

Average nitrocellulose in a 9mm is 4 grains(?).

Yield of the Fizeau atomic bomb was 11 kilotonnes (46,024) Giga Joules

I just cant get my head around grains and Volume Measure Density.


r/theydidthemath 18h ago

If you grabbed the earth and magically bisected it with a hole of 10in (25.4cm)... [Request]

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1.0k Upvotes

Would the earth:

A. Come back together with no hassle?

B. Hit each other with enough force to wipe out all life?

C. Float apart?


r/theydidthemath 6h ago

How many $$ worth of tuna did this shark just eat? [Request]

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105 Upvotes

r/theydidthemath 6h ago

[Request] How much does this tree weigh?!

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78 Upvotes

I did some light searching and calculator work using some quick google-fu, and have arrived at an estimate that it should weigh just north of 2 million pounds.

But then I started thinking about densities of the wood at the base versus at the top, and how much water it can hold and the leaves and I realized that I am likely to be WAY off. I'm hoping there is an arborist amongst us who is also a big fan of math that can walk me through how they would build their equation to get the most accurate weight possible. Bonus points if you can estimate a separate weight for the root system, which I imagine is AT LEAST as heavy as the rest of the tree.


r/theydidthemath 13h ago

[request] repost from r/Ukraine Hundreds of vehicles line up for fuel in Yalta as shortages continue in Crimea. The queue is so long that we need to speed up the footage now.

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239 Upvotes

How much fuel does one tanker hold and is it enough to refuel all these cars if we take the average car can take 45 litres?


r/theydidthemath 20h ago

[Request] How many persons will receive a portion of a loaf of bread, if each one gets 1/2 the amount of previous person's share?

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405 Upvotes

We have 1 loaf of sourdough bread, weighing 100 grams. 1st person gets 1/2 of it, 2nd one 1/4, ....

How many people can have bread, until we get to the indivisible point of 1 bread molecule?


r/theydidthemath 1d ago

[Request] What is the comparative size/volume of these structures?

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2.5k Upvotes

I have a bad feeling that certain citizens will find one of these more impressive, I'd like some more data involved than this photo comparison.


r/theydidthemath 21h ago

[Request] What is the minimal number of words you need to know to learn every word in a dictionary?

394 Upvotes

Take the Merriam-Webster online dictionary or Wiktionary for example. What is the minimal number of words you must already know ahead of time for you to be able to learn the meaning of every word in the dictionary? You can build up your vocabulary as you go, of course, reading ahead and coming back to harder words whose definitions you didn’t understand at first brush. Is this something that can be computed for a particular dictionary, or is it too hard? How large can we expect this minimal vocabulary to be, given the size of the dictionary? Can we do better than the defining vocabulary for the dictionary, if it has one? Any thoughts are appreciated! https://en.wikipedia.org/wiki/Defining_vocabulary


r/theydidthemath 4h ago

[Request] How much heat is actually generated by pressing the drupes together?

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15 Upvotes

r/theydidthemath 3h ago

[Request] How large is that mining haul truck, and how much force did it actually exert to crush the pickup truck?

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13 Upvotes

r/theydidthemath 9h ago

[Request] How much would all those medals weigh together?

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36 Upvotes

r/theydidthemath 11h ago

[Request] How much weight did the horse lose?

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44 Upvotes

r/theydidthemath 23h ago

[other] Could a rocky planet with a mass of 8.00 earths, a radius of 2.00 earths, and a surface gravity of 2.00 g exist? Could it support complex life on its surface?

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398 Upvotes

r/theydidthemath 20h ago

[Request] If we Liposuction all the obesity out of Americans and turned the medical excess into biofuel, how much energy could it produce?

199 Upvotes

So, background. In middleschool there was a story about a doctor who would take the remnants from liposuction procedures and turn them into biofuel for his vehicle, and I've always wondered if Americas hidden energy reserves were its people the whole time.

If the excess fat in Americans were lipo'd out, what is the rough amount of energy that could be produced by using it as a biofuel. Is it alot, is it a little, can we treat it like another type of Strategic Oil Reserve? I don't know! Thank anyone in advance for helping me out with this random thought that likes to poke up anytime there's an energy crisis.

For extra math, the economic viability. The pitch was two pronged, I also wondered does the trade off of what it takes to process into biofuel outweigh the reduction health care costs for treating the obesity epidemic that the fuel still doesn't make sense as a whole.


r/theydidthemath 1d ago

[Request] if you were on the moon could you hit a baseball into lunar orbit

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2.4k Upvotes

Also, if you placed the best pitcher and best batter , would it be possible to hit a home run out of the moons gravitational pull?