Conservation of Angular Momentum

Conservation of Angular Momentum - Conservation of Angular...

Info iconThis preview shows pages 1–2. Sign up to view the full content.

View Full Document Right Arrow Icon
Conservation of Angular Momentum If no external forces act on a system of particles or if the external torque is equal to zero, the total angular momentum of the system is conserved. The angular momentum remains constant, no matter what changes take place within the system. Problem 54E The rotational inertia of a collapsing spinning star changes to one-third of its initial value. What is the ratio of the new rotational kinetic energy to the initial rotational kinetic energy ? The final rotational inertia I f is related to the initial rotational inertia I i as follows No external forces act on the system, and the total angular momentum is conserved The initial rotational kinetic energy is given by The final rotational kinetic energy is given by Figure 12.11. Problem 61P. Problem 61P A cockroach with mass m runs counterclockwise around the rim of a lazy Susan (a circular dish mounted on a vertical axle) of radius R and rotational inertia I with frictionless bearings. The cockroach's speed (with respect to the earth) is v, whereas the lazy Susan turns clockwise with
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Image of page 2
This is the end of the preview. Sign up to access the rest of the document.

This document was uploaded on 11/25/2011.

Page1 / 2

Conservation of Angular Momentum - Conservation of Angular...

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online