#math mistakes

[presswoodterryryan]

Alice the Mathonaut’s Guide to Big Numbers

By Alice Hello again, fellow explorers of silliness and smarts! 🎉 It’s me, Alice the Mathonaut, swinging by with my dazzling cape and cosmic calculator to throw a vibrant fiesta in celebration of my brilliant big sister Ariel and her brand-new paper that’s bursting with excitement! This incredible brain-blaster dives deep into the fascinating world of reading and writing ENORMOUS numbers—the…

[rufusahhahh]

I had a little fun playing around w/ the idea of neo trio dandys world toons and how'd they play........... I love me some fun non=mains they're awesome

I tried punching in the numbers of how their mechanics would work and stuff because I was worried it would be unbalanced an all dat. Heres some of the very rough rough math of all that explained for like the two people that would be interested in depth 1. A 5 star extraction speed toon's extraction is roughly 1.5 units per seconds. A machine takes about 45.5 units to finish. Meaning that they'd finish it by a little less than 30 seconds With feenie's ability that would be 1.95 units per second plus tech savvy, that's 5 seconds shaved off would make a 5 star toon's extraction IF THEY ARE UNLUCKY TO GET NO SKILL CHECKS MIND YOU 17 seconds to finish. An average 3 star extraction toon with a feenie on their team with all 6 twisteds would finish machines even faster than a 4 star extraction toon would... Even if she's a little less effective as an extractor support as shelly in a long run, her ability is constant! 2. Ough.. stealth mechanics are quite underrated, imo theres a lot of ways you could mess around with them.... if the code allows it hopefully. but yeah :V! Using Molly's trinket give 2 star stealth users nearly 4 stars of stealth when they're near a machine! whcih is very excellent for distractors, esp theres a machine at broken and theres no fast extractors w/ good stealth around... also it makes 4-5 stealth toons like 7-9 stars of stealth!! Which is quite insane. I don't quite know how stealth units quite work in-game as much as the idea of "stealth units" and "detection units" compared to movement speed isn't as tangible to do the math for in my little dumbie brain. But it'd be a nice hypothetical to imagine t.pebble walking straight past on by bc of this trinket 3. I didn't feel like adding any crazy math that would align with the planets and stars and create the most fire distractor ever, simply put it, her ability would make any twisteds 19-20 speed fast reduced to how fast a common twisteds is, which is 18 movement speed. And little creatures like pebble or enraged glisten reduce to 20! Combine trixie with dog plush and you've easily mastered t.pebble

[parasolyaa]

i’ve aced my final exam (ukrainian SAT equivalent basically) right after spending the night in the underground parking lot hiding from loud ass missiles and that. that i will be proud of

[letsdontdie]

They must've had some wild dreams right after the kfc incident

[t00thpasteface]

looks around nervously. sweats. fidgets. um. when is calculus supposed to get hard. sidesteps out of the shadow of the flying ice cream truck about to land on me

[scorpionoesit]

"Extra! Extra! Read all about it: Braided Realities is Getting an Update?! Not Clickbait?!?!!*!@#%*@#$%^&"

Just to show you guys how unhinged obsessed dedicated Ali~Beta is to Braided Realities, they locked me in a virtual room for three and a half hours while drawing (and vaguely explaining) this.

The unhinged part being that this entire thing is backstory referencing a Braided prequel fic that hasn't even been written yet, that is only relevant to the next two chapters because OF A SINGLE CONVERSATION!

Ali~Beta: "Technically it's, like three conversations—"

Scorpio: "...."

Ali~Beta & Scorpio: (* °ヮ°)  (눈_눈)

Anyways, enjoy deciphering/theorizing about this hot mess.

[saturnaous]

funfact I’m extremely susceptible to timetravel shenanigans. aus save me

[river-gale]

i think non-STEM people beat themselves up too much for being bad at math. partially i think this bc shame will never help you learn and everyone is capable of improving at math with patience and practice

partially i think this bc i’m still grading these applied calculus exams from a class of 3rd-5th year engineering students and several of them have said 1 - 6 = -4. two of them have said it’s -7

[lavmellodii]

saw this drawing on pinterest and immediately thought how lovely awakened pure vanilla would look in this pose

[piratesexmachine420]

I'm annoyed by this article:

Let's do an exercise: assuming an asteroid of equal mass and composition of 16 Psyche just..appeared in low Earth orbit one day (for ease of mining), what might our profit margins look like? Assuming some unrealistically optimistic numbers 'cause I'm not a rocket scientist.

The Smithsonian quotes a price for Psyche at $10 quintillion. Dividing by its mass, we get a dollar density of 44 US cents per kilogram.

Next, do a search on your engine of choice for something like "comparison of orbital launch vehicles by payload price to LEO". I'll use the "your world in data" page that comes up as my first result for my source here. We're looking for the cheapest launcher in terms of USD/kg. At time of writing, this is the Falcon Heavy.

Now we'll perform some research on exactly what the FH's payload capacity at a given price point. Being reusable and expendable complicates the math! Moreover, Falcon Heavy hasn't actually flown that many missions, so we have to do some extrapolation. Poking around the Wikipedia article and taking some unsourced claims at face value, the cheapest configuration seems to be a partially reusable configuration (core expended, boosters recovered) with a LEO payload capacity around 57,000 kg for something like $120 million USD. That's about $2100 USD/kg. (Feel free to correct me in the future if you're better at research/new data appears!)

Now we want to find the highest-performance vacuum engines available. Let's check the Wikipedia article "Comparison of orbital rocket engines" and sort by Specific Impulse, descending to get an idea of what we're working with. As of writing, we find the best chemical option available to us is the venerable RL10 at about 450-460 seconds, with the RL10C-2 leading the pack at 465.5 seconds!

Lets go back to our Falcon Heavy payload capacity. As a ballpark figure, let's assume our spacecraft has a dry mass of ten tons. Very optimistic, IMO. With our RL10C-2's fuel to oxidizer ratio of 1:5.88 (all from the L3Harris datasheet), we can cram something like 40 tons of O2 and 7 tons of H2 onto this launch vehicle. A brief bit of back-of-the-napkin math and a consultation of the Falcon User's Guide seems to indicate this'll fit in the payload fairing. The extended one, at least.

Finally: how much of Psyche can our monster RL10 upper stage haul back? Consulting the Space Shuttle Operations Manual for a deorbit burn ballpark, we find on page 33 that it's "anywhere from 200 to 550 fps". We'll be optimistic and take 200 fps. That's about 60 m/s. Solving the rocket equation for 60 m/s = 465.5 s * 9.8 m/s/s * ln((57,000kg+x)/(10,000kg+x)), we get x=~3.5 million kg. At $0.44 per kilogram, that's about $1.5 million USD. Remember how our launch vehicle cost ~120 million? We teleported Psyche to LEO and we're still in the hole $198 million. We didn't even account for the price of our upper stage!

If our launch costs are actually something closer to $240 million, what would the dollar density have to be to break even? 240/3.5 = $68/kilogram. Taking a peek at the Wikipedia "Prices of chemical elements" we find that's equivalent to an asteroid of pure Tellurium. What about ~$360 million? Pure Uranium. Still just in LEO, mind you, and we haven't even accounted for how we're gonna crash the market when we flood it with our space metal.

You aren't making a profit asteroid mining for a couple hundred years, minimum. We are not on the cusp of a plurality of humans working off-world. Same it as it ever was.

[arty-e]

How old are the royal kids in the current chapters?

The current year: 11,544

Hearts ♥️:

Adrian (birthday boy) 17 (11,527)

Mercury 12 (11,532)

Diamonds ♦️:

Rune 23 (11,521)

Amethyst 17 (18 in a month) (11,526)

Crystal 10 (11 in a few months) (11,533)

Clubs ♣️:

Clover 21 (22 later in the year) (11,522)

Sakura 9 (10 later in the year) (11,534)

Spades ♠️:

Cyan 14 (15 in a few months) (11,529)

Camilla deceased (11,521)

Jokers✖️:

Isaac 21 (22 later in the year) (11,522)

[dorktapus42]

When you forget to prewash a linen for sewing

Gonna just add some panels to it after I wash it, it's a shift, I don't care enough lol

[trembling-amber]

the Wistful Fabulist, during the time when they were still somewhat new to the Neath, when they were known as the Saccharine Balladeer, roughly 21 and with eyes like two ambers.

[ihavevisions]

I’m losing my mind. 2000s style Vat7k website. Custom cursor, area for character bios and fun facts (sorta like the character bios for EAH), quizzes and mini games…. Can someone hear me out

[katzensilber]

Man, this is why I always hated math class.

Khan Academy gave me this easy (or so I thought) problem to solve:

"A factory makes toys that are sold for $10 a piece. The factory has 40 workers, and they each produce 25 toys a day. The factory is open 5 days a week. What is the total value of toys the factory produces in a day?"

I said to myself, okay...

10 times 40 times 25 equals 10,000. That means the factory produces $10,000 worth of value per WORKING day.

10,000 times 5 equals 50,000. And then there are two days per week (the weekend) when no value is produced. So, per week, the total value produced is still only $50,000.

And finally, there are seven days in a full week, so $50,000 divided by 7 equals roughly $7,142.86. That's the total value of toys produced per day. Not "per work day", but "per day", as it specifically says in the problem.

But what does the teacher say as he guides us through it? 10 times 40 times 25 equals 10,000, so the answer is 10,000.

That's it. The end.

He even acknowledges: "So, you might be thinking, 'Hey wait, we didn't use all the information! We didn't use the "five days per week" information!' And yeah, as it turns out, that was information we didn't need."

'As it turns out'?! Are you kidding me right now?! I carefully read the question, precisely calculated exactly what it was asking for, taking all of the provided information into account... and now you're saying I'm supposed to have somehow magically known to ignore one of those pieces of information in order to make it easier for myself?

Just admit that your problem is worded badly, dude. UGH this kind of shit drives me crazy. Why can't people use words clearly >:(

[harpyladyval]

Fellow rivalshippers. I have figured out national Rivalshipping day.

Yugi's birthday is June 4th.

Kaiba's is October 25th.

If you count up the number of days in between and then divide it, you get the exact intersection betwen their birthdays.

So the equation I did was:

(25 + 31 + 31 + 30 + 25) ➗2 = 71.

25 = June (there's only 29 days in June)

31 = July

31 = August

30 = September

25 = October

So that makes Rivalshipping day August 14th!!!