The angular speed of a fly wheel moving with uniform angular acceleration changes from 1200   rpm to 3120   rpm in 16 seconds. The angular acceleration in rad   s - 2 is:

Step-by-step solution

For uniform angular acceleration we can write, ω = ω 0 + α t ⇒ α = ω - ω 0 t Given, ω = 3120   rpm = 3120 × 2 π 60 = 104 π   rad   s - 1 and ω 0 = 1200   rpm = 1200 × 2 π 60 = 40 π   rad   s - 1 Therefore, α = 104 π   rad   s - 1 - 40 π   rad   s - 1 16 = 4 π   rad   s - 2