A turntable starts from rest and is brought up to speed with a constant angular…

PHYSICS · Single correct · CBSE · Physics · System of Particles and Rotational Motion · System of Particles and Rotational Motion

Problem

A turntable starts from rest and is brought up to speed with a constant angular acceleration of

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

for

2.0\,\text{s}

. It then rotates at that constant angular speed for

5.0\,\text{s}

before a brake applies a constant angular deceleration that brings the turntable to rest in

6.0\,\text{s}

. What is the magnitude of the brake’s angular deceleration? (a)

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

(b)

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

(c)

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

(d)

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