Undo the old axis shift first

A thin uniform disc has mass 2 kg and radius 0.30 m. Its inertia about an axis perpendicular to its plane through a rim point is 0.27 kg·m². Find the inertia about a parallel axis 0.60 m from its centre.

What is the new moment of inertia?

Organize the givens & assumptions

Mass: 2 kg
Old axis distance from centre: 0.30 m
Old inertia: 0.27 kg·m²
New axis distance from centre: 0.60 m

All axes are parallel and perpendicular to the disc; the old and new distances are measured from the central axis.

A $0.99\ \mathrm{kg\,m^2}$
B $0.45\ \mathrm{kg\,m^2}$
C $0.09\ \mathrm{kg\,m^2}$
D $0.81\ \mathrm{kg\,m^2}$

Try it on paper first. Free sample problems in every collection include the complete reasoning: find one in this collection →