The time it take for the Ferris wheel to make one revolution is 60 seconds.
A sine function is in the form:
y = Asin(wt + Ф) + D
Where A is the amplitude, w = 2πf = 2π/T, Ф is the phase shift and T is the period.
Given that:
d = 30sin(pi/30 t) + 15
Hence:
ω = π/30
π/30 = 2π/T
T = 60 s
The time it take for the Ferris wheel to make one revolution is 60 seconds.
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