Physics Help Forum Basic Circular Motion Problem

 Periodic and Circular Motion Periodic and Circular Motion Physics Help Forum

 Jun 9th 2010, 01:19 PM #1 Junior Member   Join Date: May 2010 Posts: 15 Basic Circular Motion Problem A computer disk is 8.0 cm in diameter. A reference dot on the edge of the disk is initially located at θ = +45°. The disk accelerates steadily for second, reaching 1120 rpm, then coasts at steady angular velocity for another second. What are the location and speed of the reference dot at t = 1 s? I found the speed, but I cannot get the location. I got the final angular velocity to be 37pie [rad/s]. To find angular acceleration, I divided that by 0.5 giving me 74 [rad/s^2]. But I don't know where to go from here. Do I plug that into delta S = (1/2)(angular acceleration)(delta time) ? Any help would be appreciated.
 Jun 10th 2010, 06:43 AM #2 Physics Team   Join Date: Feb 2009 Posts: 1,425 Hey! You posted this twice. Hints have been given as an answer in your previous post

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