JEE Main & Advanced
Physics
Rotational Motion
JEE PYQ-Rotational Motion
question_answer
A bullet of mass 10 g and speed 500 m/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. The angular speed of the door just ager the bullet embeds into it will be: [JEE ONLINE 09-04-2013]
A) 6.25 rad/sec
B) 0.625 rad/sec
C) 3.35 rad/sec
D) 0.335 rad/sec
Correct Answer:
B
Solution :
[b] From conservation of angular momentum (from parallel axes theorem)