Question

Moment of inertia of a disc about its own axis is I. Its moment of inertia about a tangential axis in its plane is:

• A. 5/2 I
• B. 3 I
• C. 3/2 I
• D. 2 I.

Answer 1

Answer: (A)

5/2 I

Answer 2

Moment of inertia of disc about a tangent in a plane $= \frac { 5 } { 4 } M R ^ { 2 }$ $= \frac { 5 } { 4 } ( 2 I ) = \frac { 5 } { 2 } I$