At t 2, the angular velocity is zero, with a non-zero (positive) angular acceleration. At that time, the direction of rotation for BC is changing from CW to CCW. In summary, you should never assume ...

Angular acceleration: this changes the rotational motion of the spacecraft about its center of mass. ... Rhett Allain Yes, in this example I did indeed stop the broom and it didn’t fall over.

The goal of the problem is to calculate the angular acceleration of the rotor. The analysis for this is provided below. This result shows that, although both rotation components for the rotor are ...