AP EAMCET2011PhysicsRotational Motion
Two uniform circular discs having the same mass and the same thickness but different radii are made from different materials. The disc with the smaller rotational inertia is
Options
- Athe one made from the more dense material
- Bthe one made from the less dense material
- Cthe disc with the larger angular velocity
- Dthe disc with the larger torque
Correct answer
A. the one made from the more dense material
Step-by-step solution
Moment of inertia of circular disc = 1 2 M R^2 aligned = 1 2 M ( M t ) & = 1 2 M^2 t ( As M & .= R^2 t R^2= M t ) aligned If mass and thickness are same, then I 1 So, the disc made from more dense material will have smaller rotational inertia.