Mass Moment of Inertia of Standard Objects

Q. A uniform rod of mass 300 g and length 50 cm rotates at a uniform angular speed of 2 rad/s about an axis perpendicular to the rod through an end. The angular momentum of the rod about the axis of rotation, the speed of the centre of the rod and its kinetic energy respectively are_______, _______ and _______.

1. $0.05kg-m^2/s,0.5cm/s,0.05J$
2. $0.5kg-m^2/s,0.5m/s,0.5J$
3. $0.05kg-m^2/s,50cm/s,0.05J$
4. $0.05kg-m^2/s,50m/s,5J$

Q. For the same material and the mass, which of the following configurations, of flywheel will have maximum mass moment of inertia about the axis of rotation OO' passing through the center of gravity.

1. 
2. 
3. 
4. 

Q.

The rigid body shown in the fig. (a) has a mass of 10 kg. It rotates with a uniform angular velocity $\omega$. A balancing mass of 20 kg is attached as shown in fig.(b). The percentage increase in mass moment of inertia as a result of this addition is

1. 25%

2. 50%

3. 100%

4. 200%