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23 Nov 2019
Two disks are mounted (like a merry-go-round) on low-frictionbearings on the same axle and can be brought together so that theycouple and rotate as one unit. The first disk, with rotationalinertia 2.52 kg·m2 about its central axis, is setspinning counterclockwise (which may be taken as the positivedirection) at 114 rev/min. The second disk, with rotational inertia6.88 kg·m2 about its central axis, is set spinningcounterclockwise at 757 rev/min. They then couple together.(a) What is their angular speed (rev/min) aftercoupling? (b) If instead the second disk is setspinning clockwise at 757 rev/min, what is their angular velocity(in rev/min, using the correct sign for direction) after theycouple together?
Two disks are mounted (like a merry-go-round) on low-frictionbearings on the same axle and can be brought together so that theycouple and rotate as one unit. The first disk, with rotationalinertia 2.52 kg·m2 about its central axis, is setspinning counterclockwise (which may be taken as the positivedirection) at 114 rev/min. The second disk, with rotational inertia6.88 kg·m2 about its central axis, is set spinningcounterclockwise at 757 rev/min. They then couple together.(a) What is their angular speed (rev/min) aftercoupling? (b) If instead the second disk is setspinning clockwise at 757 rev/min, what is their angular velocity(in rev/min, using the correct sign for direction) after theycouple together?
