A solid disk is mounted on a contraption with a spinning axis. Take another solid disk and place it on top and in the center of the contraption with the metal hoop. We make sure to apply the same torque to both contraptions. Which contraption spins faster and why? Explain this to me please. The concept is in the image below.

A solid disk is mounted on a contraption with a spinning axis. Take another solid disk and place it on top and in the center of the contraption with the metal hoop. We make sure to apply the same torque to both contraptions. Which contraption spins faster and why? Explain this to me please. The concept is in the image below.