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David Petersen

@calcdave.bsky.social

A fisher of minds in central Ohio

376 Followers  |  440 Following  |  110 Posts  |  Joined: 15.01.2024  |  1.8958

Latest posts by calcdave.bsky.social on Bluesky

@k8nowak.bsky.social xkcd.com/3126/

08.08.2025 19:36 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

If we could just believe women, we wouldn't need the files released.

06.08.2025 19:16 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Black men wearing boards that say "I AM A MAN" walking past US soldiers pointing bayonettes at them.

Black men wearing boards that say "I AM A MAN" walking past US soldiers pointing bayonettes at them.

01.08.2025 21:53 β€” πŸ‘ 3    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

If you finish a video or some social media and you are left feeling angry or smug, make sure you analyze your reasons and question the media you just consumed. -- @escapethispodcast.bsky.social

23.07.2025 21:34 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

And rewound music using a pencil

12.07.2025 02:27 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Entering a bank with a Victoria's Secret bag and shouting it's a C cup.

02.07.2025 16:34 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Girl pointing out parts of building she made with blue blocks usually used to represent place values in match education

Girl pointing out parts of building she made with blue blocks usually used to represent place values in match education

Photo for reference

23.06.2025 13:05 β€” πŸ‘ 4    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0
Text message bubbles reading: "Alice is still building a house/furniture/people with the blue blocks. And part of me wants to say 'these are for math, you're doing it wrong' but then she'll say stuff like 'this tv is huge it's...counts number of 10 sticks...sixty blocks!' Or 'these people are tiny. they're only 3 blocks tall. Wait, no, they're TWO blocks TALL, but they're made of three blocks. And I guess this is how she's going to learn match and I should just roll with it."

Text message bubbles reading: "Alice is still building a house/furniture/people with the blue blocks. And part of me wants to say 'these are for math, you're doing it wrong' but then she'll say stuff like 'this tv is huge it's...counts number of 10 sticks...sixty blocks!' Or 'these people are tiny. they're only 3 blocks tall. Wait, no, they're TWO blocks TALL, but they're made of three blocks. And I guess this is how she's going to learn match and I should just roll with it."

@triangleman.bsky.social Message from my wife while I work this morning.

23.06.2025 12:29 β€” πŸ‘ 10    πŸ” 0    πŸ’¬ 1    πŸ“Œ 2

Yeah, I mean, I get the math and numbers bits. But thinking about what it FEELS like is still a bit vague to me. Similar to how I don't really have a sense of 1 atmosphere of pressure because I live under that all the time.

13.06.2025 21:58 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

So this is about the force your hand has to exert to keep the apple from falling, right? Which is still not intuitive to me because I think I am accounting for exerting to keep my hand up, too. What about like pushing/pulling? A light shove? Enough to tip over...something? Or get something rolling?

13.06.2025 19:20 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

@rhettallain.bsky.social Hi, Rhett! Do you (or the physics community) have a standard example of what 1 Newton feels like? Like Wikipedia has that the force of gravity on an apple is about 2N, but that's still not too intuitive to me. So maybe how hard you'd have to push something common?

12.06.2025 21:32 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 4    πŸ“Œ 0

I think of 20% as 1/5, but I'd rather do 1/5 of 25 than 24. 1/5 of 25 is 5, and 25-5=20, so I'm expecting an answer a little less than $20 (which IRL is enough. I'd pay with a $20 bill). But if it's important to go further, then 1/5 of $1 is 20 cents, so instead of $5 it's $4.80 off. 24-4.8=$19.20

09.06.2025 13:59 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Usually it's the first 2 panels that make a good business card, but in today's comic it's the last panel that I want.

09.06.2025 12:34 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Better off dew'd.

04.06.2025 15:18 β€” πŸ‘ 1    πŸ” 1    πŸ’¬ 0    πŸ“Œ 0

Similar to riddles and lateral thinking puzzles

02.06.2025 23:31 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Is it the Star Trek ideal of "Computer, pepperoni. Hot."?

24.05.2025 12:30 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
Screenshot of a deal on Levi's Men's Jeans Memorial Day Deal. Listed for "Up to 60% off + extra 40% off."

Screenshot of a deal on Levi's Men's Jeans Memorial Day Deal. Listed for "Up to 60% off + extra 40% off."

Free jeans?!

23.05.2025 01:34 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Are you able to play the new Doom video game to get in touch with the expanded universe of Rip and Tear?

14.05.2025 11:47 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I think you'll still be able to enjoy, but may miss some Easter Eggs if you don't have the lore.

08.05.2025 17:52 β€” πŸ‘ 5    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

@ifycomedy.com You are very right about the "don't you dare close your eyes" line from Aladdin. Dial it down, bud!

07.05.2025 00:11 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0
A mysterious room with an enormous key.

A mysterious room with an enormous key.

πŸ”‘πŸšͺIt’s time to escape! Check out the newest Desmos escape room!

To play yourself: student.desmos.com/join/3jjxj9
(no need to log in but it will save your progress if you do)

Here’s the teacher link to run it with a class:
teacher.desmos.com/activitybuil...

Have fun!

02.05.2025 19:06 β€” πŸ‘ 40    πŸ” 22    πŸ’¬ 4    πŸ“Œ 3

I escaped twice! How fun!

Hope you're doing ok, friend.

04.05.2025 01:17 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

I'll be there!

23.04.2025 23:10 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

Gotcha. I like the idea and implementatin, though! I like the idea of giving student a chance to share the "extra signposting" steps

23.04.2025 19:06 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

I'm confused about your line 7 (equation 3) of the solution.

23.04.2025 17:28 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

To really make money on the stock market you don't actually want it to just go up. You want 2 things:
1. Volatility (goes up and down a lot)
2. Predictability

Then, if you have the TIME and MONEY you can ride those waves to fortune. That's why he's doing it. #RichGetRicher

09.04.2025 20:33 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

Congrats! Do you have an idea in mind of something you're working towards? An app or game or site or something?

08.04.2025 14:08 β€” πŸ‘ 1    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

@schviftyfive.tv How's the coding going? I'm really proud of you taking the time to learn more!

08.04.2025 11:41 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 1    πŸ“Œ 0

He IS the brute squad

08.04.2025 11:38 β€” πŸ‘ 0    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

@zachweinersmith.bsky.social The college where my wife is a professor is putting on a play of Beowulf this weekend. So, my son is reading your book to prepare for understanding what's going on.

31.03.2025 22:06 β€” πŸ‘ 2    πŸ” 0    πŸ’¬ 0    πŸ“Œ 0

@calcdave is following 20 prominent accounts