A bullet of mass 10 g and speed 500m/s is fired into a door and gets embedded exactly at the centre of the door. The door is 1.0 m wide and weighs 12 kg. It is hinged at one end and rotates about a vertical axis practically without friction. Find the angular speed of the door just after the bullet embeds into it.

A bullet of mass 10 g and speed 500m/s is fired into a door and gets e

1.	A bullet of mass 10 g and speed 500m/s is fired into a door and gets embedded exactly at the centre of the door. The door is 1.0 m wide and weighs 12 kg. It is hinged at one end and rotates about a vertical axis practically without friction. Find the angular speed of the door just after the bullet embeds into it.
Answer» SOLUTION :The moment of inertia of the door about the VERTICAL axis at ONE end is `ML^(2)//3` 0.625 rad/s