A sphere's value for this quantity is found by multiplying two-fifths by the mass and the radius squared.
This quantity appears in a dot product with the time derivative of angular velocity in one of Euler's equations. For a given body in a plane, adding the values for this quantity with respect to the axes lying on that plane is equivalent to the third axis value for this quantity. Steiner developed a method for finding this value using the (*) parallel axis theorem. A sphere's value for this quantity is found by multiplying two-fifths by the mass and the radius squared. For 10 points, identify this rotational analogue of mass which is symbolized capital I.
This quantity appears in a dot product with the time derivative of angular velocity in one of Euler's equations.
mass {moment of inertia} [prompt on {I} until mentioned; accept {angular mass} or {rotational inertia} or polar {moment of inertia} of mass; do not accept or prompt on {inertia}]   [MB]