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 ...

Rotational mass is usually called the moment of inertia. Note that angular velocity (using the symbol ?) is a vector. Convention puts the angular velocity vector along the axis of rotation.

The lift force is proportional to the square of the ball’s velocity and acts perpendicular to this velocity and to the angular velocity vector ...

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 ...