A compact disc (CD) stores music in a coded pattern of tiny pits 10^-7meters dee

Question

A compact disc (CD) stores music in a coded pattern of tiny pits 10^-7meters deep. The pits are arranged in a track that spirals outward toward the rim of the disc; the inner and outer radii of this spiral are 25.0mm and 58.0mm , respectively. As the disc spins inside a CD player, the track is scanned at a constant linear speed of 1.25m/s . What is the angular speed of the CD when scanning the innermost part of the track? What is the angular speed of the CD when scanning the outermost part of the track? The maximum playing time of a CD is 74.0 .minutes. What would be the length of the track on such a maximum-duration CD if it were stretched out in a straight line? What is the average angular acceleration of a maximum-duration CD during its 74.0-min playing time? Take the direction of rotation of the disc to be positive. Please give detailed answers by showing the original formulas and step by step solution. Thank you.

Explanation / Answer

Hi, this is probably too late, but hopefully others will find it useful. alpha = dw/dt thus, alpha average = delta(w) / delta (t) so (21.6 - 50)/ 4440 = -6.41 X 10-3 this the answer for mastering physics

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