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Spinning Disc Direction Puzzle

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October 7, 2020 by puzzler Leave a Comment

A spinning disc is painted black on one half and white on the other (i.e., the line forming the border between the black and white regions of the disc is a diameter of the disc). The disk is spinning on a turntable in an unknown direction at an unknown speed. You have special video cameras that can observe the color of a single point on the disc. How many cameras do you need to determine the direction the disc is spinning?

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