Both federal child labor laws and Massachusetts state law concur that the minimum age to work is 14 (with some exceptions). But child labor laws in each state may vary regarding the minimum age to work and which permits are needed. When there is a conflict between federal and state laws, the strictest law will apply. Although 14 is the official age Massachusetts youth generally begin working, there are exceptions.
The moment of inertia, otherwise known as the angular mass or rotational inertia, of a rigid body is a tensor that determines the torque needed for a desired angular acceleration about a rotational axis.
The radius of the disk is R, and the mass of the disk is M. Using the parallel axis theorem and theequation for the moment of inertia of a disk about its central axis developed in the previous example, Eq. (8), the moment of inertia of the disk about the specified axis is Fig.