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Mark

Tether a Spinning Ball

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Judging from the recent thread “Where are you?” some people here are interested in spherical geometry, so you might be interested in a curious fact about space discovered by the English theoretical physicist P.A.M. Dirac (1902-1984) – specifically the “space” of rotations in three dimensional space.

At the bottom of the following webpage you’ll find a link to a computer program (Windows) that generates movies illustrating his discovery in various ways:
How a Spinning Object Can Remain Connected to a Stationary One

It can also show a movie that illustrates the principle behind the spinning jenny used to twist fiber into thread. 

 

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13 hours ago, Mark said:

Judging from the recent thread “Where are you?” some people here are interested in spherical geometry, so you might be interested in a curious fact about space discovered by the English theoretical physicist P.A.M. Dirac (1902-1984) – specifically the “space” of rotations in three dimensional space.

At the bottom of the following webpage you’ll find a link to a computer program (Windows) that generates movies illustrating his discovery in various ways:
How a Spinning Object Can Remain Connected to a Stationary One

It can also show a movie that illustrates the principle behind the spinning jenny used to twist fiber into thread. 

 

A disk mounted on a mathematically thin axle with a bearing one point thick at the center. 

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On 1/3/2019 at 7:27 PM, Mark said:

Judging from the recent thread “Where are you?” some people here are interested in spherical geometry, so you might be interested in a curious fact about space discovered by the English theoretical physicist P.A.M. Dirac (1902-1984) – specifically the “space” of rotations in three dimensional space.

At the bottom of the following webpage you’ll find a link to a computer program (Windows) that generates movies illustrating his discovery in various ways:
How a Spinning Object Can Remain Connected to a Stationary One

It can also show a movie that illustrates the principle behind the spinning jenny used to twist fiber into thread. 

 

Wow! Mind blown!

Darrell

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