CLOSE
Original image
iStock // fullempty

Mathematician Calculates Rotational Speed of Fidget Spinner in Fidgets Per Second

Original image
iStock // fullempty

How fast does a fidget spinner spin? It's a simple question with a simple answer, but a complex path to that answer. The issue lies in analyzing an extremely fast-moving object with simple tools, like a smartphone.

In the video below, mathematician Matt Parker turns to a spectrogram sound-analyzing app to solve this problem. Spectrograms are visual representations of sound, allowing the viewer to pick out certain frequencies within an audio clip and measure their intensity. By figuring out the sound the fidget spinner makes, Parker can sort out how many Hertz (cycles per second) the spinner is rotating at.

The first task is making the spinner itself stable, so it's easy to spin and becomes a reliable target for audio recording. Parker attaches the device to a drinking glass, and mounts the smartphone above it, with the microphone pointed at the edge of the spinner. Then by blowing the fidget spinner with compressed air, the mathemagic happens.

Parker calculates the absolute speed of the tips of the fidget spinner, as well as the speed of the spinner in revolutions per minute—the latter is roughly 3750 rpm! (For comparison, a typical car engine runs around 2000-3000 rpm when cruising.) The video is full of further analysis and methodology.

Tune in for some delightful applied mathematics...and be sure to wear your safety gear!

Incidentally, Parker used the SpectrumView app, though there are others like it. He also posted a screenshot of the spectrogram, as seen in the video, in case you want to test your own spinner.

Original image
arrow
video
Handy Uses For Those Silica Gel Packets
Original image
5581090463001

Don’t throw away your packets of silica gel! They soak up moisture and have plenty of uses (just don’t eat them).

Original image
Yulia Brodskaya
arrow
video
The Artist Who Draws With Paper
Original image
Yulia Brodskaya
5581095838001

Most artists draw on paper, but artist Yulia Brodskaya draws with paper. Check out more of her amazing paper quilling creations on Instagram or on her personal site.

SECTIONS

arrow
LIVE SMARTER
More from mental floss studios