Rotational inertia, also known as moment of inertia, is a measure of an object's resistance to changes in its rotational motion. It depends on the mass distribution and shape of the object.
The rotational inertia of a disk can be calculated using the formula I = 1/2 * MR^2, where M is the mass of the disk and R is the radius.
The unit of rotational inertia is kilogram-meter squared (kg-m^2) in the SI system. In other systems, it can be expressed as slug-foot squared (slug-ft^2) or pound-square foot (lb-ft^2).
As the mass or radius of a disk increases, the rotational inertia also increases. This means that a disk with a larger mass or radius will have a greater resistance to changes in its rotational motion.
Yes, the rotational inertia of a disk can be changed by altering its mass or radius. For example, by increasing the mass or radius, the rotational inertia will also increase. Additionally, changing the shape of the object can also affect its rotational inertia.