Three uniform circular discs, each of mass 0.5kg and radius 10cm, are kept in contact with each other as shown in the figure. Find the moment of inertia of the system when it rotates about the axis AB.

Three uniform circular discs, each of mass 0.5kg and radius 10cm, are

1.	Three uniform circular discs, each of mass 0.5kg and radius 10cm, are kept in contact with each other as shown in the figure. Find the moment of inertia of the system when it rotates about the axis AB.
Answer» SOLUTION :`I=I_(1)+I_(2)+I_(3)` `I=(5MR^(2))/(4)+(5MR^(2))/(4)+(MR^(2))/(4)impliesI=(11MR^(2))/(4)` `M=0.5kg`, `r=10cm=10xx10^(-2)m` `:.` MOMENT of INERTIA of the system `I=(11MR^(2))/(4)=(11xx0.5xx(0.1)^(2))/(4)` `=1.375xx10^(-2)kgm^(2)`