164 OR m Bullet Rod Block Problem 7 The puck in the figure

Last updated: 5/3/2023

164 OR m Bullet Rod Block Problem 7 The puck in the figure above on the left has a mass of 0 120 kg The distance of the puck from the center of rotation is originally 0 4 m and the puck is sliding with a speed of u 0 8 m sec The string is pulled downward through the hole in the frictionless table and the new distance of the puck from the center of rotation is 0 25 m What is the new speed of the puck Answer vy 1 28 m sec Problem 8 In the figure above on the right a 0 001 kg bullet with initial speed 1800 m sec is fired into a 0 5 kg block attached to the end of a 0 60 m rod of mass 0 50 kg Point A is the pivot point for the rod and the bullet stays inside the block after the collision What is the angular speed w of the system after the collision The moment of inertia of the rod about point A is I Me and the moment of a particle is Imr Treat the block as a particle and also treat the bullet as a particle Answer 4 5 rad sec