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Old Jun 9th 2010, 01:19 PM   #1
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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.
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Old Jun 10th 2010, 06:43 AM   #2
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Hey! You posted this twice. Hints have been given as an answer in your previous post
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