A rigid disk is initially at rest

PHYSICS · Single correct · AP · Physics 1: Algebra-based · Torque and Rotational Dynamics · Torque and Rotational Dynamics

Problem

A rigid disk is initially at rest. Beginning at

t=0

, it experiences a constant angular acceleration of

+2\,\text{rad/s}^2

for

4\,\text{s}

, followed immediately by a constant angular acceleration of

-1\,\text{rad/s}^2

for the next

2\,\text{s}

. What is the disk’s angular velocity at

t=6\,\text{s}

? (a)

3\,\text{rad/s}

(b)

8\,\text{rad/s}

(c)

6\,\text{rad/s}

(d)

2\,\text{rad/s}