Question

PRAC on inertia, centre of gravity, centre of mass...What do these equations represent? What am I trying to find???

What do these equations represent? What am I trying to find???

.

Σή I, = m, Στή n, Mt 1, 12 (integer)

if necessary, related info included:

i dont need to know the answers

Answer 1

Here first you are calculating net moment of inertia by considering each individual particles.

and all particles have same mass but different position. that is why m have been taken common and $\sum r^{2}$ is calculated first then multiplied by m.
hence net moment inertia is given as

$I_{2}=m\sum r^{2}$

Then you have calculated net moment of inertial by considering whole particle as a single object

and it is given as

ML²

Now you have calculated the ratio i.e. ML²/I₂ means how much factor it differ i.e. n