A computer disk is 8.0 in diameter. A reference dot on the edge of the disk is initially located at The disk accelerates steadily for 0.50 , reaching 2000 , then coasts at steady angular velocity for another 0.50. What is the tangential acceleration of the reference dot at = 0.25? What is the centripetal acceleration of the reference dot at = 0.25 ? What is the angular position of the reference dot at = 1.0? What is the speed of the reference dot at = 1.0?