This SAT Math question got no correct submissions (mindyourdecisions.com) 11 points by strategy 11y ago ↗ HN
[–] lexcorvus 11y ago ↗ This is a corollary of the coin paradox: http://mathworld.wolfram.com/CoinParadox.html [–] wodenokoto 11y ago ↗ The animation shows 1 revolution for 1 rotation, but the text says its 2.That is very confusing. [–] nitwit005 11y ago ↗ I was also confused by that until I changed my perspective. Watch the marker inside the circle.It starts pointing left. Half way around the inner coin it's pointing left again. At the end it's pointing left once more.That requires two rotations. The curve its graphing confuses things.
[–] wodenokoto 11y ago ↗ The animation shows 1 revolution for 1 rotation, but the text says its 2.That is very confusing. [–] nitwit005 11y ago ↗ I was also confused by that until I changed my perspective. Watch the marker inside the circle.It starts pointing left. Half way around the inner coin it's pointing left again. At the end it's pointing left once more.That requires two rotations. The curve its graphing confuses things.
[–] nitwit005 11y ago ↗ I was also confused by that until I changed my perspective. Watch the marker inside the circle.It starts pointing left. Half way around the inner coin it's pointing left again. At the end it's pointing left once more.That requires two rotations. The curve its graphing confuses things.
4 comments
[ 3.6 ms ] story [ 21.2 ms ] threadThat is very confusing.
It starts pointing left. Half way around the inner coin it's pointing left again. At the end it's pointing left once more.
That requires two rotations. The curve its graphing confuses things.