Problem
The circular disc of radius ๐๐ is divided into 7 equal parts and colored in the sequence "๐ฝ๐ฐ๐ฉ๐ฎ๐๐ถ๐น". What is the minimum velocity at which it will seem white to a human? (Persistence of human vision is ๐.๐๐
Solution
We know, velocity v = distance ๐/time t.
=> v = 2ฯr/t
=> v = 2ร3.1416ร5/0.1
=> v = 314.16 ๐๐-1
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