Answer:
Explanation:
Moment of inertia of toy top = 3 x 10⁻² kgm²
Torque created = F x r
= .30 x 2.5 x 10⁻² N m
Torque = moment of inertia x angular acceleration
angular acceleration = .3 x 2.5 x 10⁻² / 3 x 10⁻²
α = .25 radian /s²
Angular displacement in 5 revolution θ = 5 x 2π = 10π radian
θ = ω₀t + 1/2 α t²
initial angular velocity ω₀ = 0
10π = 1/2 α t² = .5 x .25 t²
t² = 251.2
t = 15.85 s
