How does conservation of angular momentum help solve problems quantitatively

[magnas]

Hi,
I am by now very used to the concept of conservation of momentum and energy, however i had never solved a problem using the conservation of angular momentum.
Well, in the case where angular momentum is conserved, we do not have a torque net. But, how this conservation law helps us to determine quantitatively ?
Could you illustrate the concept with an example?
Thank you very much.

 

[mfb]

Here are some threads with examples:
https://www.physicsforums.com/showthread.php?t=658488
https://www.physicsforums.com/showthread.php?t=648312
https://www.physicsforums.com/showthread.php?t=410156
https://www.physicsforums.com/showthread.php?t=327169

3 of them are from the "similar threads for:"-feature, and I think you can find more with the search function.