Answer:
Part(a): The required change in angular displacement will be .
Part(b): The angular displacement will be increased by a factor of 2.
Explanation:
If , , and represents the initial angular velocity, the final angular velocity , the angular acceleration and the change of angular displacement s, then from angular kinematic equation, we can write
Part(a):
Given, , and . Substituting ll the values in the above equation, we have
So the angle through which the parts rotates before reaching the final speed is .
Part(b):
Given, , and . So,
Therefore, the angular displacement will be changes by a factor of 2.