Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with rotational inertia 3.50 kg • m? about its central axis, is set spinning counterclockwise at 250 rev/min. The second disk, with rotational inertia 5.00 kg · m2 about its central axis, is set spinning counterclockwise at 600 rev/min. They then couple together. (a) What is their angular speed after coupling? rev/min (b) If instead the second disk is set spinning clockwise at 600 rev/min, what is their angular speed after they couple together? rev/min (c) What is their direction of rotation after they couple together? O counterclockwise O clockwise

Two disks are mounted (like a merry-go-round) on low-friction bearings on the same axle and can be brought together so that they couple and rotate as one unit. The first disk, with rotational inertia 3.50 kg • m? about its central axis, is set spinning counterclockwise at 250 rev/min. The second disk, with rotational inertia 5.00 kg · m2 about its central axis, is set spinning counterclockwise at 600 rev/min. They then couple together. (a) What is their angular speed after coupling? rev/min (b) If instead the second disk is set spinning clockwise at 600 rev/min, what is their angular speed after they couple together? rev/min (c) What is their direction of rotation after they couple together? O counterclockwise O clockwise

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter11: Angular Momentum

Section: Chapter Questions

Problem 89AP: A solid cylinder of mass 2.0 kg and radius 20 cm is rotating counterclockwise around a vertical axis...

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A solid cylinder of mass 2.0 kg and radius 20 cm is rotating counterclockwise around a vertical axis through its center at 600 rev/min. A second solid cylinder of the same mass and radius is rotating clockwise around the same vertical axis at 900 rev/min. If the cylinders couple so that they rotate about the same vertical axis, what is the angular velocity of the combination?
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