Instructor: Dr. Tatiana Erukhimova Physics 218: Mechanics Instructor: Dr. Tatiana Erukhimova Lecture 37 Hw: Chapter 15 problems and exercises

Orbital motion Conservation of Angular Momentum

Moment of Inertia For symmetrical objects rotating about their axis of symmetry:

A block of mass M is cemented to a circular platform at a distance b from its center. The platform can rotate, without friction, about a vertical axle through its center with a moment of inertia, Ip. If a bullet of mass m, moving horizontally with velocity of magnitude vB as shown, strikes and imbeds itself in the block, find the angular velocity of the platform after the collision. b vB axle top view

L before = L after

What is the moment of inertia of a disk of thickness h, radius R and total mass M about an axis through its center?

Rotational Kinetic Energy

R O F

Have a great day! Hw: Chapter 15 problems and exercises