A solid bar is spun about a central axis perpendicular to the bar. What torque is required to accelerate the bar from rest to 50.0 rad/s in 21.5 s if the mass of the bar is 455 g and the length of the bar 35.0 cm?

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?