A fly wheel rotates with a uniform angular acceleration. If its angular velocity increases form 20 pi rad/s to 40 pi rad/s in 10 seconds. Find the number of rotations in that period.

A fly wheel rotates with a uniform angular acceleration. If its angula

1.	A fly wheel rotates with a uniform angular acceleration. If its angular velocity increases form 20 pi rad/s to 40 pi rad/s in 10 seconds. Find the number of rotations in that period.
Answer» Solution :Initial angular velocity `omega_0` = `20 pi ` rad/sec FINAL angular velocity `omega`= `40pi` rad/sec Time (t) = 10 SECONDS Angular acceleration `alpha = (omega-omega_0)/(t)=( 40 pi - 20 pi)/(10)` `alpha = 2pi` rad/`sec^2`