- #1

Prishon

- 50

- 8

For even n there is no rotation anymore. All cilinders are at rest.

For uneven n the cilinders end up with contrary velocities. If there are n cilinders in contact then the absolute value of their angular velocities will be 1/n of the initial value.

For example, 3 cilinders (assuming their mass and initial angular velocities are 1) end up with angular momentum 1/3 and kinetic energy of 1/9 of the initial value.

But how is the energy dissipated? 1/9 of the momentum and energy are left in the cilinders. The rest of the momentum has flown into Earth. But where has the energy gone. Not into the Earth(well a very small part). Has it gone by friction? But what if the cilinders were toothwheels?