A uniform solid disk of mass and radius starts from rest

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering physics

Problem

A uniform solid disk of mass

2.0\,\text{kg}

and radius

0.40\,\text{m}

starts from rest. What constant net torque must be applied to give the disk an angular acceleration of

5.0\,\text{rad}\,\text{s}^{-2}

? (a)

1.6\,\text{N}\!\cdot\!\text{m}

(b)

0.40\,\text{N}\!\cdot\!\text{m}

(c)

0.80\,\text{N}\!\cdot\!\text{m}

(d)

0.64\,\text{N}\!\cdot\!\text{m}