Answer:
Explanation:
7 rev /s = 7 x 2π rad /s
angular velocity = 14π rad /s
Angular acceleration α = increase in angular velocity / time
= 14π - 0 / 9
α = 4.8844 rad / s
θ = 1/2 α x t² θ is angle of rotation , t is time
= 1/2 x 4.8844 x 9²
= 197.8182 rad
2π n = 197.8182
n = 31.5 rotation
During acceleration , no of rotation made = 31.5
During deceleration : -----
deceleration =
Angular deceleration α = decrease in angular velocity / time
= 14π - 0 / 13
α = 3.3815 rad / s
θ = 1/2 α x t² θ is angle of rotation , t is time
= 1/2 x 3.3815 x 13²
= 285.736 rad
2π n = 285.736
n = 45.5 rotation
total rotation
= 45.5 + 31.5
= 77 .
