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2π radians = 360 degrees = 1 cycle = 1 revolution
T (period in time/cycle) = 1/f (frequency in cycles/time), and ω = 2πf
For circular motion: s = rθ, where s = distance in units of length, r = radius, θ = angle in radians
ω = angular velocity (or angular frequency) in radians/time or revolutions/time
v = rω, where v = linear velocity in units of length/time, r = radius
θ = ωt = angular distance in radians

A merry-go-round with a radius of 15 feet is rotating with an angular velocity of 2 rev/min.
3. What is its angular velocity in radians/sec?
4. What is the period of the merry-go-round in sec/cycle?
5. How far in feet does a person on the rim travel in 1 sec?
6. How many degrees does a person turn through in 1 sec?
7. What is the frequency of the merry-go-round in cycles/sec?
8. What is the linear velocity in feet/sec of a point on the rim of the merry-go-round?