(1)M = J dω/dt = M0 - b ω
J dω / (M0 - b ω) = dt
∫(0, ω) dω / (M0 - b ω) = ∫(0, t) dt
ω = M0/b * ( 1 - e^(- b/J t) )
(2)t → ∞,得最大角速度 ωmax = M0 / b
(3)θ = ∫(0, t) ω dt = M0/b * ( t + J/b e^(- b/J t) - J/b )
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