Write out the angular velocity vector ω in terms of the two components described above. Take a time derivative of ω to get the angular acceleration α of the bar. When taking this derivative, you will ...

The angular momentum can be in a different direction than the angular velocity - but in this case, I is not a scalar quantity. Here is the short scoop on the angular momentum principle.

Before the car moves, the angular momentum of the Earth plus cars is: (magnitude only since the direction does not change) Since the cars have the same angular velocity as the Earth, I can add the ...