Physics

Problem

A thin hoop of mass

0.60\,\text{kg}

and radius

0.20\,\text{m}

is rigidly glued to the flat face of a uniform solid disk of mass

1.2\,\text{kg}

and the same radius. The two objects share the same central axis. What is the rotational inertia of the composite object about this common axis? a)

0.036\,\text{kg}\cdot\text{m}^{2}

0.043\,\text{kg}\cdot\text{m}^{2}

0.048\,\text{kg}\cdot\text{m}^{2}

0.060\,\text{kg}\cdot\text{m}^{2}