Question 2: It is very often convenient to consider the angular momentum of a collection of particles about their ________, since this simplifies the mathematics considerably.

Question 5: Because of the cross product, L is a ________ perpendicular to both the radial vector r and the momentum vector p and it is assigned a sign by the right-hand rule.

Question 9: For an object with a fixed mass that is rotating about a fixed symmetry axis, the angular momentum is expressed as the product of the ________ of the object and its angular velocity vector: