A disc of radices R has mass 9m. A hole of radius R/3 is cut from it as shown in the figure. What is the moment of inertia of the remaining part about an axis passion through centre O of the disc and perpendicular to the plane of the disc?

Q: A disc of radices R has mass 9m. A hole of radius R/3 is cut from it as shown in the figure. What is the moment of inertia of the remaining part about an axis passion through centre O of the disc and perpendicular to the plane of the disc?

Numerical

(a) 6 m R2

(b) 4 m R2

(c) 2 m R2

(d) 3.5 m R2

Ans: (b)