Find the moment of inertia of a pair of spheres, each having a mass m and radius r kept in contact about the tangent passing through the point of contact.

Answer

A, B, D

Explanation

The two bodies of mass m and radius are movgn along the common tangent. Therefore moment of inertial of th first body about XY tangent
`mr^2+2/5mr^2`
`=moment of inertia of the sencon body XY tangent
`=mr^2+2/5mr^2=7/5mr^2`
Therefore, net moment of inertia
`=7/5mr^2+7/5mr^2`