Question
In: Physics
The outside diameter of the playing area of an optical Blu-ray disc is 11.75 cm, and...
The outside diameter of the playing area of an optical Blu-ray disc is 11.75 cm, and the inside diameter is 4.50 cm. When viewing movies, the disc rotates so that a laser maintains a constant linear speed relative to the disc of 6.70 m/s as it tracks over the playing area.
What is the average angular acceleration of a Blu-ray disc as it plays an 3.5-h set of movies? (Assume the disk is scanned starting at its inner radius moving outward. Express your answer to two significant figures.)
Solutions
Expert Solution
In order to find the average angular acceleration of the disc we have to find the angular velocity at inner and outer portion of the disc.
The angular velocity is given by 
Using equation, 
we can find angular acceleration.
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