Question

45. moment of inertia of a disc about its own axis is i. Its moment of inertia about a tangential axis in its plane is

Answer 1

The moment of inertia about its tangent  axis =i+mr^2

Answer 2

Let the moment of inertia about any of the two perpendicular axes passing through the diametral plane be I. Thus using perpendicular axis theorem we get 2I=  

2

MR  

2

 

​  

or I=  

4

MR  

2

 

​  

 which is half the original moment of inertia