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.
Calculating Moment of Inertia. The graphic on this page shows an equation of how to calculate the moment of inertia in its most general form. It basically consists of the following steps: Measure the distance r from any particle in the object to the axis of symmetry; Square that distance; Multiply that squared distance times the mass of the particle