Q. A 2.10g bullet embeds itself in a 1.10kg block, which is attached to a spring of force constant 780 N/m.
1) If the maximum compression of the spring is 5.60 cm, find the initial speed of the bullet.
2) Find the time for the bullet-block system to come to rest.
Q. A 21 kg solid door is 220 cm tall, 94 cm wide. What is the door's moment of inertia for rotation about a vertical axis inside the door, 17 cm from one edge?