A solid uniform disk of mass and radius starts from rest and rotates about its…

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

Problem

A solid uniform disk of mass

6.0\,\text{kg}

and radius

0.25\,\text{m}

starts from rest and rotates about its central axis with a constant angular acceleration of

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

. After the disk has turned through

300

revolutions, what is its rotational kinetic energy? (a)

2.8\times 10^{3}\,\text{J}

(b)

1.4\times 10^{3}\,\text{J}

(c)

7.1\times 10^{2}\,\text{J}

(d)

2.3\times 10^{2}\,\text{J}