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A small object moving in a horizontal circle of radius 0.2m makes 8 revolutions per second. Determine its centripetal acceleration.
(KCSE 2002 paper 1 question 26).

Answer Text:
a =#omega^2 r# but #w =2pif =2times22/7 times 8 = 50.286 rightarrow a #=50.2862 x 0.2= 505.74m/s2 .