@rhettallain.bsky.social You might recognize the animated ball texture that I shamelessly borrowed from you ;)

video of steel ball oscillations: aip.figshare.com/articles/med...

vpython simulation for the steel ball: www.glowscript.org#/user/Patric...

Oscillation of a Ball on a Concave Surface A simple method to measure the coefficient of rolling friction, µR, is to allow a ball to roll back and forth in a curved track or on a concave lens or mirror.1

Cute little project I did with Rod Cross. pubs.aip.org/aapt/pte/art...

Looking forward to seeing this. My lecture on vibrating bats is approaching. I am debating about giving an homework on torpedo using my code this year but am afraid it might be too advanced stuff for some.

yeah, they use chatGPT now...;)

I do not have the book with me right now so I go from memory, but I think there are a few chapters in the book ''sports physics''. If you don't ahve the book, if you search for Rod Cross, you will find many many interesting papers on the bouncing and rolling of balls in various sports.

Nice. After a few oscillations it should reach a steady-state temperature. I haven’t done the full calculation, but if the rise is a few degrees your FLIR One might be able to detect it. I have the iPhone version of the camera, but I can’t use it anymore now that I’m on Android.

Yes, this is what my simulation shows. Can all be explained using Euler’s equations + a few reasonable assumptions that however need experimental validation, but nothing unusual in terms of physics. I’ll write more about this once I finish my SSW piece, which I’ve been procrastinating on for ages...

If his starting lead had been about the same as the distance of Muncy to the bag (more than that is a risk of double play in case of line drive), it would not even have been close at home plate...

I thought you said that you didn't care who wins ;)

baseball.physics.illinois.edu/AJP-Aug2008....

Nice. Also, if you throw something up at 50km/s, then you also, from conservation of momentum, throw yourself in the opposite direction. I bet the energy associated with this would make quite a crater lol

Doing the ratio removes the need to know the spring constant since it cancels out.

In Waves and Vibrations book by French, the spring's mass modifies the frequency: ω = √(k/(m + M/3)) instead of √(k/m). I measure this live in class with 0.5 vs 1.5 kg masses. Classical ratio predicts √3, but that’s not what we get. When I ask why, everyone blames air resistance… lol.

Good catch. The brick wall was installed in 1937. Are the 3 buildings we see at 2:19 the same as today?

How so?

YouTube video by SportsCC78 1925 Chicago Cubs vs. Cincinnati Reds Footage ⭐️ [In 4K Color, Speed Adjusted]

Babe Ruth dominated in an era when the overall level of play was barely above what we’d call high school caliber today. Change my mind ;) www.youtube.com/watch?v=-FU5...

In my experience, you cannot trust AI for even slightly complex calculations. You must be able to double check every steps, there are always errors. You still save a lot of time if you can do that, but if you follow blindly, you are looking for trouble...

Any good ones missing from my collection?

Another variable that nobody talks about is the orientation of the seams. Average Cd for two seam vs four seam are not the same. With all else being equal, depending on where your spin axis is pinned, you will get a different distance...

I already have the t-shirt!

I am curious about what exactly he failed...

50 Greatest Prog Rock Albums of All Time The 50 greatest progressive rock albums of all time, including Pink Floyd, Genesis, Yes, Rush and more

Oh come on. Back to Harmonium album: the fact that a french album made it to the top 50 of all time by Rolling stone tells you all you need to know about it. www.rollingstone.com/music/music-...

YouTube video by MECA PD CHANNEL HARMONIUM - LES CINQ SAISONS - FULL ALBUM - CANADIAN UNDERGROUND - 1975

No french songs? Here is arguably the best french Canadian album of all time. The first one has no lyrics so you should be ok ;) youtu.be/NkNzlf2MczE?...

Alternatively, if someone wants to make a heavier bat but keep the same MOI, how much greater can q be with a torpedo profile? That’s where things get really interesting.

But the real question is: if I give you a piece of wood and ask you to cut it into a bat of mass M, which shape gives the better q at the sweet spot? (We already know the MOI will be lower.)

Very interesting. However, we're comparing apples to oranges here — a normal bat vs. another with different mass and density that happens (probably by design, as you mentioned) to have the same MOI.

Your brower should be able to translate things easily. Will be happy to help is something is not clear.

Bon, je vois que le gif animé ne fonctionne pas. Revoici les 2 images