Science Memes

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Speed (mander.xyz)

submitted 5 months ago by [email protected] to c/[email protected]

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[–] [email protected] 33 points 5 months ago (1 children)

The 100 km/h seems a bit much to me, too, but I'm having a hard time finding info on the speed of these...

[–] [email protected] 35 points 5 months ago* (last edited 5 months ago) (2 children)

Looked up a video of a gentle one. A revolution takes about 2𝜋 seconds, at which the speed in m/s is the same as the radius in meters, or around 5. Multiply by 3.6 to convert into 18 km/h, which seems realistic for the milder ones. The apparent horizontal centrifugal acceleration will then be 𝑣²/𝑟 = 5 ms⁻² ≈ 0.5𝑔, which corresponds to an angle of approx. 26° from the verical, reasonably close to the video.

The one depicted in the image probably goes about 2x as fast, pulling perhaps 2𝑔 horizontally for an angle of approx. 63°.

[–] [email protected] 14 points 5 months ago (1 children)

Damn he mathed all over them

[–] [email protected] 4 points 5 months ago

I'd let them math all over me anytime 👌😩🧮

[–] [email protected] 6 points 5 months ago* (last edited 5 months ago) (2 children)

How does one count in π • seconds?

[–] [email protected] 12 points 5 months ago

It's about 6.5 seconds in the video. I rounded that to 2𝜋 so I could do the math in my head (other than the tan⁻¹(0.5), of course)

[–] [email protected] 9 points 5 months ago

"One, two, thr- pi"