A horizontal disk with a radius of 10 cm rotates about a vertical axis through its center. The disk starts from rest at t = 0 and has a constant angular acceleration of 2.1 rad/s2. At what value of t will the radial and tangential components of the linear acceleration of a point on the rim of the disk be equal in magnitude?
A. 0.55 s
B. 0.63 s
C. 0.69 s
D. 0.59 s
E. 0.47 s
Answer: C
Physics & Space Science
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