Question 7.24:
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. Find the angular speed of the door just after the bullet embeds into it.
I HAVE A DOUBT IN ONE OF THE STEPS.....WHY DO WE TAKE THE 1M AS THICKNESS AND 1/2 M AS THE RADIUS OF THE DOOR...??? WOULD YOU BE EXPLAIN WITH A DIAGRAM .
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https://www.meritnation.com/ask-answer/question/s-is-fired-into-a-door-and-gets-embedded-exactly-at-the/system-of-particles-and-rotational-motion/6328148
https://www.meritnation.com/ask-answer/question/s-is-fired-into-a-door-and-gets-embedded-exactly-at-the/system-of-particles-and-rotational-motion/6328148