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m =40 kg
r =10cm =0,1 m
t = 5 s
f = 40π Hz
Dit α
jawab.
i = 1/2 mr^2
= 1/2 40 . 0,1^2
= 20 . 0,001
= 0,2 kgm^2
ω = 2πf
= 2 π 40 π
= 80 π^2
α = Δω/Δt
= 80π^2/5 = 16 π rad/s