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 7.50 m/s as it tracks over the playing area. 5) What is the average angular acceleration of a Blu-ray disc as it plays an 7.5-h set of movies? (Express your answer to two significant figures.)

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