12.88. Model: Model the merry-go-round as a rigid disk rotating on frictionless bearings about an axle in the center and John as a particle. For the (merry-go-roundJohn)+system, no external torques act as John jumps on the merry-go-round. Angular momentum is thus conserved. Visualize:The initial angular momentum is the sum of the angular momentum of the merry-go-round and the angular momentum of John. The final angular momentum as John jumps on the merry-go-round is equal to finalfinal.IωSolve:John’s initial angular momentum is that of a particle:JJ
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