Coin Rotation Paradox

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Jika koin A (jari-jari r) menggelinding tanpa slip mengelilingi tepi koin B (jari-jari r), keliling yang ditempuh adalah 2πr — sama dengan keliling koin A. Intuisi: koin A berputar tepat sekali. Kenyataan: koin A berputar dua kali. Putaran ekstra berasal dari revolusi koin A mengelilingi pusat koin B.

Ini relevan dalam astronomi: planet yang mengorbit matahari berotasi satu kali ekstra per orbit relatif terhadap bintang jauh (sidereal vs synodic rotation). Paradoks ini pernah menjadi soal SAT yang diperdebatkan karena jawaban resminya salah — Educational Testing Service akhirnya menarik soal tersebut dan memberikan kredit penuh ke semua peserta.

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