The mass, and how it is distributed- how far the masses are on average from the axis of rotation. However, it is the square of the distance that counts in this case.
mass, velocity and radius
The answer will depend on (a) whet the dimensions of the two quantities are, and (b) what the missing operator between the two quantities is.
A line has two fold rotational symetry.
Inertia is directly proportional to mass. Unless you mean rotational inertia, in which case it depends on the shape, but for two objects of the same shape (and mass distribution), the more massive always has higher inertia.
A general parallelogram has rotational symmetry of order two.
They are in thermal equilibrium, not rotational equilibrium.
The quotient of two quantities called a ratio.
Two.
two-fold
line
Two.
Any two non-zero quantities are always proportional. If the two quantities are X and Y, they are proportional to X/Y.