A uniform disk is rotated about its symmetry axis. The disk goes from rest to an angular speed of 11 rad/s in a time of 0.20 s with constant angular acceleration. The rotational inertia and radius of the disk are 1.5 kg · m² and 11.5 cm, respectively. 

(a) What is the angular acceleration during the 0.20 s interval? 

(b) What is the net torque on the disk during this time? 

(c) After the applied torque stops, a frictional torque remains. This torque causes an angular acceleration of magnitude 9.8 rad/s². Through what total angle θ (starting from time t = 0) does the disk rotate before coming to rest? 

(d) What is the speed of a point halfway between the rim of the disk and its rotation axis 0.20s after the applied torque is removed?