A point object with mass M=2.0kg is attached a distance R=1.75m from the fixed center of a disk as shown in the figure. The disk starts rotating from rest with constant angular acceleration α=5.00s2rad about an axis perpendicular to the plane of the page through the disk's center. After how much time (in seconds) is the tangential component of the point object's acceleration equal in magnitude to the centripetal component of the point object's acceleration?
[Figure: Disk with point mass attached at distance R from center]
(A) 0.769 (B) 0.592 (C) 0.500 (D) 0.447 (E) 0.350