@lephysichien.bsky.social
Astrophysicist, interested in sport science, baseball, hockey, Crossfit and chess among other things. https://www.laphysiquedubaseball.ca/
yeah, they use chatGPT now...;)
December 4, 2025 at 4:54 PM
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.
November 27, 2025 at 4:46 PM
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.
November 18, 2025 at 4:16 PM
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...
November 8, 2025 at 12:49 AM
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...
November 2, 2025 at 6:25 PM
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 ;)
November 2, 2025 at 2:44 AM
I thought you said that you didn't care who wins ;)
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
September 9, 2025 at 3:13 PM
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.
July 29, 2025 at 1:56 AM
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.
July 29, 2025 at 1:55 AM
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?
June 30, 2025 at 1:15 PM
Good catch. The brick wall was installed in 1937. Are the 3 buildings we see at 2:19 the same as today?
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...
June 15, 2025 at 6:13 PM
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...
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...
June 8, 2025 at 2:22 PM
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!
June 7, 2025 at 2:57 AM
I already have the t-shirt!
I am curious about what exactly he failed...
May 13, 2025 at 5:55 PM
I am curious about what exactly he failed...
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-...
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
www.rollingstone.com
April 19, 2025 at 2:58 PM
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-...
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?...
HARMONIUM - LES CINQ SAISONS - FULL ALBUM - CANADIAN UNDERGROUND - 1975
YouTube video by MECA PD CHANNEL
youtu.be
April 19, 2025 at 2:28 PM
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.
April 7, 2025 at 2:44 PM
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.)
April 7, 2025 at 2:44 PM
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.
April 7, 2025 at 2:44 PM
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.
April 4, 2025 at 4:24 PM
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
April 4, 2025 at 3:25 PM
Bon, je vois que le gif animé ne fonctionne pas. Revoici les 2 images