Answer
Smallest radius to largest radius is $4,3,2,1$.
Work Step by Step
Centripetal acceleration is equal to $$a=r\omega^2$$ So, as radius increases, centripetal acceleration increases. This means that the steepest curve has the largest radius, and the flattest curve has the smallest radius. Ranking curves in order from smallest radius to largest radius is $4,3,2,1$.
