Question

A solid sphere is melted and cast into a hollow sphere. How does that affect its center of gravity?

Answer 1

Answer:

I assume this question comes from a physics course study of rotating objects, so you have probably heard the term "moment of inertia" before. In layman's terms, moment of inertia is a measurement of how much a spinning object weighs multiplied by how far away the parts of the object are from the center of rotation. The larger the moment of inertia, the harder it is to get something spinning. This is why a figure skater can spin faster when she pulls her arms and legs inward; she is reducing her moment of inertia.