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A linear back-and-forth motion from purely rotational motion. This is the Tusi couple, a geometric mechanism introduced by the Iranian scholar Nasir Tusi in the 13th century. 🎥 marmarjoon

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388,185 次观看 • 8 个月前 •via X (Twitter)

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This video looks like a rotating wheel. But watch just one single sphere. It never rotates. Every ball only moves in a perfectly straight line back and forth. This is simple harmonic motion where linear position follows: x = R cos(ωt) By perfectly offsetting the timing of each straight path, the collective motion creates the illusion of rotation.

This video looks like a rotating wheel. But watch just one single sphere. It never rotates. Every ball only moves in a perfectly straight line back and forth. This is simple harmonic motion where linear position follows: x = R cos(ωt) By perfectly offsetting the timing of each straight path, the collective motion creates the illusion of rotation.

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The Economic Freedom Fighters Johannesburg caucus submitted a Motion: Removal of registered indigent beneficiaries from the city of Johannesburg debtor's list. Motion was approved by council. The EFF is always on the side of the poor. The DA and FFplus rejected the motion and must be remembered as antipoor parties and anti worker.

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