7. An aluminum disk has a mass m, radius R, and area A. It has an area mass density (mass per unit area) which varies with distance from the center of the disk and can be describe by o=ar, where r is the distance from the center of the disk and a is a constant. (a) What are the units of a? (b) What is the moment of inertia of the disk about an axis through the center?

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Torque

Torque is the rotational equivalent of linear force in physics and mechanics. Based on the course of study, it is also known as the moment of force, rotational force, or turning effect.