Please see attachments.
ans. A)Wbd = 4.38 rad/sec curving down;
Vd = .306 m/sec up.
B) Wbd = 0; Vd = 1.05 m/sec down.
C) Wbd = 4.38 rad/sec curving up; Vd = .306 m/sec down.
See attached file.
Because, vb = r*w
r = 0.07 m
w = 15 rad/s
=> vb = 15*0.07 = 1.05 m/s
a.) For Q(read as theta) = 0:
vb = 1.05 (horizontal ->)
direction of vb/d: Because, DB makes an angle ...
The solution is provided step-by-step to determine the disk angular velocity and a diagram is attached.