A fly wheel rotates about fixed axis and slows down from 300 rpm to 60 rpm in 2 seconds. Its angular retardation in rad/sec²?
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Answer:
4π rad/s²
Explanation:
Initial angular speed
ωi = 300 rpm = 300× 2π/60 rad/s = 10π rad/s
Final angular speed
ωf = 60 rpm = 60× 2π/60 rad/s = 2π rad/s
time, t = 2 s
Angular retardation = (ωi - ωf)/t
= (10π - 2π)/2
= 4π rad/s²
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