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Back to 10.3 Dynamics of Rotational Motion: Rotational Inertia

10.3 Exercise 6

Avg difficulty 2.5

Consider two sizes of disk, both of mass M. One size of disk has radius R; the other has radius 2R. System A consists of two of the larger disks rigidly connected to each other with a common axis of rotation. System B consists of one of the larger disks and a number of the smaller disks rigidly connected with a common axis of rotation. If the moment of inertia for system A equals the moment of inertia for system B, how many of the smaller disks are in system B?

  1. 1
  2. 2
  3. 3
  4. 4

OpenStax College Physics 2e, 10.3 Dynamics of Rotational Motion: Rotational Inertia, exercise 6

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Adapted from College Physics © 2022 Rice University. Licensed under CC BY 4.0. Sources: College Physics 2e, College Physics for AP® Courses 2e. Imported at revision f98d7a7.