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August 4, 2015

Homework Help: Physics

Posted by Andrea on Sunday, December 2, 2012 at 10:20pm.

There is a door that is 1.0 m wide and can rotate about a vertical axis without friction. The door’s mass is 15 kg and is free to swing open. Someone fires a 10 g bullet at 400 m/s into the exact center of the door, perpendicular to it.

Find the angular velocity of the door just after the bullet sticks in the door.

Show whether kinetic energy is conserved.

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