The two rotor blades of 800-mm radius rotate counterclockwise with a constant angular ve...

The two rotor blades of 800-mm radius rotate counterclockwise with a constant angular velocity rad/s about the shaft at O mounted in the sliding block. The acceleration of the block is a_O = 3 m/s². Determine the magnitude of the acceleration of the tip A of the blade when (a) θ = 0, (b) θ = 90°, and (c) θ = 180°. Does the velocity of O or the sense of ω enter into the calculation?