A mechanic needs to replace the motor for a merry-go-round. The merry-go-round should accelerate from rest to 1.5 rad/s in 7.0 s
. Consider the merry-go-round to be a uniform disk of radius 6.0 m and mass 25,000 kg. Suppose that it is supported by bearings that produce negligible friction torque.
1. When the object is waiting to be released, it is storing a lot of potential energy. When it is released, the potential energy that was once stored is converted into kinetic energy.