Posted by Gaurav on Thursday, January 26, 2012 at 5:00am.
I assume they want the angular velocity in radians/sec units.
After 5 revolutions, the angle turned is
A = 10 pi radians
The angular acceleration rate is
alpha = 4 pi radians/s^2
The time since starting is given by
A = (1/2)*alpha*t^2
t^2 = 2A/alpha = 5 sec^2
t = 2.236 s
w(at t = 2.236 s) = alpha*t = 28.1 rad/s
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