Angular Momentum

Question 1

CofM of 1D object

Answer 1

Sum of (mass of element * position) / Sum of masses of elements

Question 2

CofM of a 3D object

Answer 2

X-coordinate: (mass of element * position in x) / Sum of masses of elements
Y-coordinate: (mass of element * position in y) / Sum of masses of elements
Z-coordinate: (mass of element * position in z) / Sum of masses of elements