Q. A 25 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, 13 cm from one edge?
Q. A bullet of mass 4.3 g is fired horizontally into a 8.6 kg wooden block at rest on a horizontal surface. The coefficient of kinetic friction between block and surface is 0.13. The bullet stops in the block, which slides straight ahead for 2.4 m (without rotation). (a) What is the speed of the block immediately after the bullet stops relative to it? (b) At what speed is the bullet fired?