A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at

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A horizontal disk with a radius of 10 cm rotates about avertical axis through its center. The disk starts from rest at t =0 and has a constant angular acceleration of 2.1 rad/s2.What is the angular speed, of a point at the rim of the disk at themoment when radial and tangential components of the linearacceleration are equal in magnitude?
Select one:
a.
1.00 1/s
b.
1.63 1/s
c.
0.69 s
d.
0.48 s
e.
1.45 1/s