A Potter's Wheel Has the Shape of a Solid Uniform $7.0 \mathrm {~kg}$

Multiple Choice

A potter's wheel has the shape of a solid uniform disk of mass $7.0 \mathrm {~kg}$ and radius 0.65 m.It spins about an axis perpendicular to the disk at its center.A small 2.1 kg lump of very dense clay is dropped onto the wheel at a distance 0.41 m from the axis.What is the moment of inertia of the system about the axis of spin?

A) 1.8 kg ∙ m²
B) 1.5 kg ∙ m²
C) 0.40 kg ∙ m²
D) 2.5 kg ∙ m²