Joe wraps a rope several time around the barrel, and attaches the end of the rope to a bucket of mass m = 5 kg. The bucket hangs motionless H = 2.5 m above the ground because Joe is holding onto the barrel.
At time t = 0, Joe releases the barrel. The bucket starts to fall downwards, pulling on the rope and causing the barrel to spin. As the bucket falls, the barrel spins faster and faster.
How long does it take the bucket to reach the ground?
The wire breaks! The pole starts to swing downwards around the hinge without friction of any kind.
It works! They are now holding hands and spinning around point "X", Jane AJ from the center and Fred AF from the center.
To end their program, they pull each other close, until their centers of mass are only bJ = 0.28 meters and bF = 0.21 meters from point "X".
Fred now turns the disk a small distance theta from its resting position and releases it. The disk starts to oscillate back and forth.