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Los datos que te dan son:
Ф = 5 vuel = rev
t = 20 s
w = ?
Tenemos que convertir las vueltas a rad
1 rev------------------------------- 2πrad
5 rev------------------------------x
x = (5 rev * 2 πrad) / 1 rev
x = 10 πrad
x = 10 (3,1416) rad
x = 31,41 rad
Calculamos la velocidad angular
w = Ф/t
w = 31,41 rad / 20s
w = 1,57 rad/s
Respuesta.
w = 1,57 rad/s