Two friction disks A and B are to be brought into contact without slipping when the angular velocity of disk A is 240 rpm counterclockwise. Disk A starts from rest at time t = 0 and is given a constant angular acceleration of magnitude α. Disk B starts from rest at time t = 2 s and is given a constant clockwise angular acceleration, also of magnitude α. Determine

(a) The required angular acceleration magnitude α,

(b) The time at which the contact occurs.

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B 150 mm 200 mm