Question

Two uniform circular discs, each of mass `1kg` and radius `20cm`, are kept in contant about the tangent passing through the point of contact. Find the moment of inertia of the system about the tangent passing through the point of contact.

Answer 1

`Mass M=1 kg, r=20xx10^(-2) m`
`I_(1)=(MR^(2))/4+MR^(2)=(5MR^(2))/4`
Similarly, `I_(2)=(5MR^(2))/4,I=I_(1)+I_(2)`
`:. I=(10MR^(2))/4=(10xx1xx(20xx10^(-2))^(2))/4=0.1 kgm^(2)`