1. The problem statement, all variables and given/known data Theres an object which makes a pendulum motion.Lets suppose we hang the mass to the ceiling.We released the object with inital angle 0 to the ceiling.(I mean the angle between the object and the ceiling is zero).Whats the moment of the Inertia to the point A. A is a point on the ceiling which middle of the motion.Lets suppose Lenght of the rope is L then.Imagine the inital position.Theres mass m and it makes zero angle with object.Now A point will be (Objects position-L)=A Mass of object m Lenght of rope L 2. Relevant equations I=∫mr^2dr 3. The attempt at a solution M=∫mdr which r goes to -r to r and I=∫mr^2dr so I=∫dM/dr r^2 dr I=∫dMr^2 I=Mr^2 Is this correct.