Comment on The SAT Question Everyone Got Wrong

• SpaceNoodle@lemmy.world ⁨11⁩ ⁨months⁩ ago

  This should have been an article. What’s the summary?

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  • protist@mander.xyz ⁨11⁩ ⁨months⁩ ago

    I summarized it above, there’s an extra rotation included when the outer circle moves along the inner circle, essentially falling a bit with every roll forward. If the outer circle rolled along a straight line of the same length as the circumference of the inner circle, it would only roll 3 times, but moving around the circle instead adds exactly one extra rotation. That other gent says this is used in calculating orbits too, where you’re also moving forward while constantly falling

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    • SpaceNoodle@lemmy.world ⁨11⁩ ⁨months⁩ ago

      I read an article about it. Everybody is doing a shit job of describing what happens. The outer circle naturally makes a full rotation as it travels around the inner one, as the path it follows goes around a full 360°, so that counts as one of the rotations it ends up making, which is in addition to the 3 due to travel around the circumference.

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      • OmnislashIsACloudApp@lemmy.world ⁨11⁩ ⁨months⁩ ago

        thank you, that was the comment that explained it for me

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  • schmidtster@lemmy.world ⁨11⁩ ⁨months⁩ ago

    Add the radius together. If the circle is inside. A-B 3-1 = 2.

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    • protist@mander.xyz ⁨11⁩ ⁨months⁩ ago

      Does not compute

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      • schmidtster@lemmy.world ⁨11⁩ ⁨months⁩ ago

        It’s in the video.

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    • SpaceNoodle@lemmy.world ⁨11⁩ ⁨months⁩ ago

      [deleted]

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      • schmidtster@lemmy.world ⁨11⁩ ⁨months⁩ ago

        …?

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