r/theydidthemath • • 25m ago

[Request] How strong is this casual kicking from Dicta Striker?

• Upvotes

I was thinking you could calculate a casual kick/swing of the legs and then calculate how much it would take to make that hole, but I'm not an expert so you do what you want.


r/theydidthemath • • 31m ago

[Request] Turban versus Helmet?

• Upvotes

I saw a Sikh man riding a bike down the road, and couldn't help but wonder: how much impact protection (if any) does a full turban provide compared to a bicycle helmet?


r/theydidthemath • • 2h ago

[Request] How much kinetic energy does he have at 94.34 mph, expressed in joules and the equivalent energy in TNT?

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0 Upvotes

​

Suppose the skateboarder and all his equipment have a combined mass of 85 kg.

The questions:

**Kinetic energy:** How much kinetic energy does he have at that speed, expressed in joules and the equivalent energy in TNT?

**Stopping distance:** If he brakes with a constant deceleration of 0.8g, how many metres does he need to stop? How long does it take?

**Impact:** If he crashes into a rigid barrier and comes to a complete stop in 0.1 seconds, what average force acts on his body, expressed in newtons and multiples of his body weight?

**The helmet problem:** Suppose his helmet can safely absorb 150 J of energy before its protective capacity is exceeded. What fraction of his total kinetic energy would that represent?

**The tricky & strange part:** If his speed increased by just 10%, by what percentage would his kinetic energy increase?


r/theydidthemath • • 3h ago

[REQUEST] How much money could you reasonably make every day donating blood and still live a healthy life?

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171 Upvotes

r/theydidthemath • • 4h ago

[Request] Torque produced by these girls?

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12 Upvotes

Or like the centripital force or whatever force doing round and round produces?

If they have the average female weight.


r/theydidthemath • • 4h ago

[Request] Formula for 3D Printing Profits

1 Upvotes

I volunteer for a non-profit organization. I'd like to help fundraise by offering 3D printed items to sell at markets. Is there a formula that I could use to cover my costs and donate the profits to the organization? I want to help, but I don't want to lose money doing it. If it helps, I print on a BambuLab P2S. And I use BabmuLab filaments. Thanks for any help you can offer.


r/theydidthemath • • 4h ago

[Other] Rolled Up Shirt Sleeve

1 Upvotes

Most days I wear a button down shirt with the sleeves rolled/folded up. My shirt felt a little tight in the arms today so I started thinking about the size of the opening after rolling/folding and how it changes with each roll/fold. Anyone want to figure out the math that tells me the inner and outer diameter after each roll/fold? Just seemed like an interesting math problem 🤷🏼‍♂️


r/theydidthemath • • 5h ago

[Other] is this even possible? If yes how hard do you need to yeet the fly?

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15 Upvotes

r/theydidthemath • • 5h ago

[Request] I genuinely wanna know

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1.2k Upvotes

r/theydidthemath • • 5h ago

[Self] progress per day of vivaldi operation in Ukraine

0 Upvotes

277 sqkm were declared cleared from the vivaldi operation. I wondered how much per day that was. May ?- October 14. Approximately 5 months approximately 150 days. Approximately 1.8 km a day.

Just doing math: not evaluating the operation.


r/theydidthemath • • 6h ago

[Request] CANDY pt.2

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0 Upvotes

Hello guys! I posted another one last week about tootsie rolls, the number was 188 (i lost)

anyway, they have a new one this week! pls help me!


r/theydidthemath • • 6h ago

[Request] How hot would the surrounding air and rock Frodo and Sam are on be with all that lava from Mount Doom be? Lord of the Rings Return of the King.

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143 Upvotes

Something I’ve always wondered was could people actually survive being on that rock with all that lava spilling down the mountain side? From what I see lava can be anywhere from 1300 degrees Fahrenheit to 2200, I mean that’s hot right? I’d expect the heat to rise up and warm the air around them and even more so the lavas heat would conduct through the rock they’re on and burn them. Could they even breathe the air? I know it’s fantasy and all but let’s put people in that exact scenario in real life.


r/theydidthemath • • 6h ago

[Off-site] I will be infinitely rich in ∞ years!

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1.2k Upvotes

@GLabsPlus on Twitter (X) calculates the total amount of money you can get if you were to receive the amount specified by that term of the harmonic series every minute.


r/theydidthemath • • 7h ago

[Request] If one probability occurs in medium and a another probability occurs in another medium

0 Upvotes

If the first one changes upon the change in the medium cause the probability increased but this new medium must be such that it should be vast enough for such probability and expand stochastically but if this probability is reduced a deterministic way of formation can be done , so, the medium becomes a combined property such that the very probability has a chronological order of a different probability and this reduces the second probability , if this process takes place infinitely then the medium infinitely changes with different segments of density


r/theydidthemath • • 7h ago

[Request] What is the biggest size a planet can be, that an average human male can escape its gravitational pull/orbit with a single jump?

3 Upvotes

r/theydidthemath • • 7h ago

[Request] What are the odds that any particular sentence I utter has never been uttered before in human history?

0 Upvotes

r/theydidthemath • • 8h ago

[Request] if you were at the bottom of the Mariana Trench, how much fart would you need to produce for it to survive the journey to the surface?

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0 Upvotes

r/theydidthemath • • 8h ago

[Request] Yesterday I set a PR on a 1/3 chance at guessing my login number verification code for 12 straight days. Should i have bought the power ball instead?

0 Upvotes

Every day for work, to login it sends 3 random numbers to phone that i have to pair with the correct number shown on my work laptop. For 12 straight days i correctly guessed the number before it was shown to me. This is a new personal best for me and im wondering if i used up all my good luck and if the probability of this is as unlikely as to winning the powerball.


r/theydidthemath • • 11h ago

[request] How powerful is this Landspout

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25 Upvotes

I wonder how powerful is this landspout that managed to lift the blue car and hit another car in Malaysia? I'm just curious because we Malaysian never had any Tornado like situations.


r/theydidthemath • • 11h ago

How much would it cost to open up a fully functional, and fully staffed Burger King on the surface of the Moon? How much would you have to charge per whopper to make a profit? [request]

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0 Upvotes

r/theydidthemath • • 11h ago

If 1 Reddit moderator can ruin 1 great post in 5 minutes, and every additional moderator doubles the rate of destruction, how many moderators would it take to remove every post made on reddit at all times? [request]

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0 Upvotes

r/theydidthemath • • 12h ago

[Request] How much does a smart trainer heat up after an hour of use.

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0 Upvotes

You cycle on it for an hour at 200W.
Flywheel weight 5kg, whole system 15kg.
Room temperature : 25C

What percentage of your power gets converted into heat?
Is most of it going into the flywheel/magnets surrounding it?

How would covering the trainer with an insulated box affect its cooling potential and how much would that increase its temperature.


r/theydidthemath • • 14h ago

[Request] Could this possibly be true?

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8 Upvotes

Google says saltwater contains approximately 35grams/kg of water and the oceans contain approximately 1.335 sextillion liters (1.335 × 10²¹ liters)


r/theydidthemath • • 14h ago

[Request] What is the least number of people that need to believe Elon Musk's net worth is zero for it to actually become that?

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0 Upvotes

r/theydidthemath • • 15h ago

[Request] Fart in the ocean

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11 Upvotes

Genuinely curious what is the max depth at which a fart made in the ocean can still reach the surface 😅

Is that even calculable ?