A uniform disk with a mass of 4 kg and a radius of 0.2 m is rotating

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A uniform disk with a mass of 4 kg and a radius of 0.2 m is rotating with a rotational velocity of 20 rad/s.
a. What is the rotational inertia of the disk? (See fig. 8.15.)
b. What is the angular momentum of the disk? 

Uniform disk or cylinder 1= }mr2

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