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Conservation of Angular Momentum

# Conservation of Angular Momentum - Conservation of Angular...

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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

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