Your answer is partially correct. 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 2.58 kg-m2 about its central axis, is set spinning counterclockwise (which may be taken as the positive direction) at 140 rev/min. The second disk, with rotational inertia 7.60 kg•m² about its central axis, is set spinning counterclockwise at 941 rev/min. They then couple together. (a) What is their angular speed after coupling? If instead the second disk is set spinning clockwise at 941 rev/min, what are their (b) angular velocity (using the correct sign for direction) and (c) direction of rotation after they couple together? (a) Number i 77.24 Units N-m/rad (b) Number i -69.82 Units rev/s (c) clockwise

Your answer is partially correct. 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 2.58 kg-m2 about its central axis, is set spinning counterclockwise (which may be taken as the positive direction) at 140 rev/min. The second disk, with rotational inertia 7.60 kg•m² about its central axis, is set spinning counterclockwise at 941 rev/min. They then couple together. (a) What is their angular speed after coupling? If instead the second disk is set spinning clockwise at 941 rev/min, what are their (b) angular velocity (using the correct sign for direction) and (c) direction of rotation after they couple together? (a) Number i 77.24 Units N-m/rad (b) Number i -69.82 Units rev/s (c) 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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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 3.31 kg·m2 about its central axis, is set spinning counterclockwise (which may be taken as the positive direction) at 495 rev/min. The second disk, with rotational inertia 5.57 kg·m2 about its central axis, is set spinning counterclockwise at 773 rev/min. They then couple together. (a) What is their angular speed after coupling? If instead the second disk is set spinning clockwise at 773 rev/min, what are their (b) angular velocity (using the correct sign for direction) and (c) direction of rotation after they couple together?