Question

Starting from rest, a disk rotates about its central axis with constant angular acceleration.

A) Its angular velocity decreases
B) Its angular velocity remains constant
C) Its angular velocity increases linearly
D) Its angular velocity increases exponentially

Answer 1

The angular velocity of a disk rotating with constant angular acceleration decreases.

Step-by-step explanation:

The correct answer is A) Its angular velocity decreases.

When a disk rotates with constant angular acceleration, its angular velocity decreases. This is because angular velocity is related to the linear velocity through the formula:

angular velocity = linear velocity / radius

As the disk rotates, its radius remains constant, so if the linear velocity decreases, the angular velocity will also decrease. Therefore, option A) is the correct answer.