An engineer has an odd-shaped 13.5 kg object and needs to find its rotational inertia about an axis through its center of mass. the object is supported on a wire stretched along the desired axis. the wire has a torsion constant κ = 0.618 n·m. if this torsion pendulum oscillates through 28 cycles in 58.1 s, what is the rotational inertia of the object?

Is a  vector quantity  that refers to "the rate at which an object changes its position." imagine a person moving rapidly - one step forward and one step back - always returning to the original starting position. while this might result in a frenzy of activity, it would result in a zero velocity. because the person always returns to the original position, the motion would never result in a change in position. since velocity is defined as the rate at which the position changes, this motion results in zero velocity. if a person in motion wishes to maximize their velocity, then that person must make every effort to maximize the amount that they are displaced from their original position. every step must go into moving that person further from where he or she started. for certain, the person should never change directions and begin to return to the starting position.

The rocks expand when there hot/warm  and contract when they are cold.