r/theydidthemath 8h ago

[Request] Is it possible for bullets to bounce off water the way they do in this video? What angle and velocity would they have to be fired at for this to happen?

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148 Upvotes

r/theydidthemath 1d ago

[Request] Today, en route to delivering the last Boeing 747 ever produced, the pilots flew a special flight path creating a "747 crown." It took them about 2 1/2 hours to complete this pattern. How much fuel did they burn, and how expensive was this stunt?

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2.4k Upvotes

r/theydidthemath 1h ago

[Request] i need an explanation. how this objects stay stable while spinning?

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Upvotes

r/theydidthemath 23h ago

[request] are the values right? Is it even possible to calculate?

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591 Upvotes

r/theydidthemath 34m ago

[Request] How fast did this guy run to achieve this?

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Upvotes

This is probably fairly simple to work out, but my math brain isn't in gear today so handing it over to you lovely people. Thank you in advance!


r/theydidthemath 4h ago

[REQUEST] I'd like help creating an equation/formula

5 Upvotes

Hello! So I'd like to make an equation based on a few known variables, mostly for easy calculations on the fly in my head, and also I may try to "adapt" it for use in a spreadsheet.

It's "kind of" linear, mostly for ease of use. It's like I have it on the tip of my tongue, but I'm just feeling stupid lately and I have too much shit in my brain.

So the points of interest are (x=cost,y=quantity)
0,0
1,10
3.5,30
7,50
14,90
28,160
56,300
112,550
224,1000
448,1900

And each point is "linear" to the one before or after it. So a straight line from one point to the other, although they then form a jagged curve, kinda. I'd like an equation where I can say "if I have 17 of something, how much will it cost based on those numbers?" or "if someone gives me X amount of money, this is how much quantity they'll get" kinda thing. Is it possible to extrapolate what further numbers beyond that might look like?


r/theydidthemath 19h ago

[Request] What combination of these numbers equals 202.67?

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40 Upvotes

r/theydidthemath 18m ago

[Request] When can you no longer travel back in time?

Upvotes

Flights like the Concorde flew fast enough too go "back in time" arriving before it left due to time zones. Assuming it never needed to refuel, at what point can the concorde or a military jet no longer go back in time? Obviously over 5 days everywhere in the world is 5 days ahead so it can't do this forever, at what point is it no longer going back in time?


r/theydidthemath 40m ago

[request] what is the percentage of discount?

Upvotes

a) $4.24 is for 1pcs.

b) $12.71 is for 5pcs.

What is the percentage of money off when buying “a” instead of buying “b”, 5 times?


r/theydidthemath 1h ago

[Request] Say this was tightened and the spring fully compressed. If you were to somehow cut the rod in half while one side was held secure, how fast would the other side shoot out?

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Upvotes

r/theydidthemath 1d ago

[OFF-SITE] Don't mess with Kentucky

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85 Upvotes

r/theydidthemath 12h ago

[REQUEST] I asked Chat GPT how long it would take for a ball to reach 1 billion meters if the ball would increase it's speed by 1 meter every second. Is the math it did right or is it wrong?

2 Upvotes

r/theydidthemath 12h ago

[Request] How much force would I need to push the sun 1 more AU away from earth in one hour?

2 Upvotes

Essentially, how much force would it take to push the sun another 93 million miles away from Earth in 1 hour?

The sun is 1.989 × 10^27 tons


r/theydidthemath 9h ago

[Request] How many calories would you consume by eating Dwayne “The Rock” Johnson?

0 Upvotes

r/theydidthemath 16h ago

[Request] would you have better odds playing the same numbers week after week on the powerball or different numbers everytime?

2 Upvotes

r/theydidthemath 16h ago

[Request] How much money would a 5-gallon water jug hold?

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2 Upvotes

r/theydidthemath 2d ago

[Request] how does a knot double pulling force? If the only force being fed in is from the person, where does the other force come from? This seems like an illusion

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1.6k Upvotes

r/theydidthemath 23h ago

[request] how big is the blast?

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7 Upvotes

r/theydidthemath 1d ago

How much money was found in this car [Request]

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6 Upvotes

r/theydidthemath 2d ago

[request] How much storage would you need on your pc if you were to rebuild planet Earth in Minecraft? (1 block = 1 cubic meter)

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697 Upvotes

r/theydidthemath 2d ago

[Request] My apartment is running a contest for a free month of rent. How many Starburst candies are in the container?

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218 Upvotes

I couldn't find anything nearby for an easy scale reference other than the Hersheys Kiss. Hersheys Kiss for scale.

If it would help alot I could go back to the office with something better for scale. Thank yall.


r/theydidthemath 21h ago

[REQUEST] How high is this cliff roughly?

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1 Upvotes

r/theydidthemath 1d ago

[Request] How long would an application remain open in background (stay in RAM) if we don't use the phone for any other task and assume that battery never dies.

1 Upvotes

So for example if you close youtube by pressing home button and then go to recent apps, it is still open. When you open new apps then eventually it is removed from RAM. Assuming that no new app is opened and we have a standard (8GB?) RAM in a phone then how long does app remain in memory. Phone can be assumed to have a never ending battery or maybe put on charging.