Veritasium is wrong about the 1982 SAT question.

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This is about that Veritasium said in an video that a circle that i 1/3 of another one will rotate 4 times around the 3 times bigger circle even is it is just 3 times bigger.
And in this video I am going to prove him wrong.
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The original video is not wrong, smart guy. He explains the two answers and how you can get 3 or 4 depending on the point of view. He also said the SAT question was worded incorrectly, which is that really matters. I’m questioning whether you even watched the video.

michaelscott
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No, he's right. It depends on the viewpoint, as he states. There is always one rotation baked into rolling around the larger circle. It is a consequence of the path.

jongraham
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Depends on how you define rotation. For me, the question was clear -- 1 rotation = 360 degree turn of Circle A. In which case the answer is 4. If you define it as "same contact point touching Circle B again" -- then it is 480 degrees, and the answer is 3.

vics-videos
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The text displaying the number of rotations in the video is incorrect! Circle A starts at the top of circle B. When circle A travels to the right of circle B, circle A has made exactly 1 complete rotation. When circle A travels' to the bottom of circle B, circle A has made exactly 2 rotations. When circle A travels' to the left of circle B, circle A has made exactly 3 rotations. And when circle A travels' to the top of circle B (back to it's starting point), circle A has made exactly 4 rotations. Watch the video closely and observe this!
One rotation is defined as rotating 360 degrees. Circle A rotates 360 degrees when it is to the right of circle B, so that would be one complete rotation.

geraldwe
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As veritasium explains, a circle will make three revolutions around its own axis (as in the video) but from the reference of a outside viewer circle a will revolve 4 times.

molusk
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Basic counting error. Delete your video and learn counting from any kindergarden kid.

bohemiankhichdi
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1 is possible in a specific viewpoint, but 1 can't be the only answer

bunnybee
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The question said “how many revolutions, ” so the answer is one—after one revolution, it will be back at the starting point

albertnortononymous
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Problem 1: Only when the circle A is fully upright in your perspective does it count as a full rotation. A full rotation is described as 360 degrees.

Problem 2: Circle A is not exactly 1/3 of circle B, so of course there is going to be a margin of error. If we look closely at the video, we can see that circle B measures at 19.75 cm, while circle A measures at around 6.5 cm. 1/3 of 19.75 is approximately 6.58 cm, which, if anything, is basically a whole tenth bigger.

That is why your claim is incorrect. Any questions?

GrnPas
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The small disk starts with the wording horizontal. A rotation is complete when the words are horizontal again. This takes four rotations.

donbeal
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Note that each "rotation" identified in the video is actually 1.25 rotations of the Circle A disk. At 0:24 the rotation starts, and the disk is completes 1 full rotation at 0:30, not at 0:32 as the video text overlay indicates.

FredPost-wkxj
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Must be pretty hard to be wrong alone.

Pulivari
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did you even watch his video? he went over this exact thing

ellesvenne
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Idk if you're doing this for clout but you are completly wrong and cannot count to 4.

philipkarlsson
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You literally didn't watch the vid your talking about or have no comprehension skills. He literally goes over this in the vid smh.

Copingeditor