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السلام عليكم ورحمة الله وبركاته

Classical Mechanics , 2nd Edition. Author : H. Goldstein

:Please I need help to solution this question

Q1: consider a system of N particles

:a) Find the expression for the total angular momentum and torque about

The origin of the coordinates O
point p in space with position rp

b) For the cases in part a, what would be in the condition for angular momentum to be conserved

.