1. Angular Momentum Friday, November 7

3. Today: Angular Momentum Chapter 9 Section 7

4. Angular Momentum, L Compare to linear momentum Direction??

5. Conservation of Angular Momentum What is needed for L to be conserved?

6. Problem 9.34 Divers change their body position in midair while rotation about their c of m. A diver leaves the board with her body nearly straight, then tucks into a somersault position. If her moment of inertia in the straight position is 14 kgm 2 and in tuck is 4.0 kgm 2 by what factor is her angular velocity when tucked greater than when straight?

7. Problem 9.34

8. This week’s Laboratory Experiment

9. L conserved?

10. Problem 9.32 What is the angular momentum of a bar rotating at 120 rpm. The bar rotates about its center, has a mass of 500g and is 2 m long.

11. Problem 9.32

12. Monday Energy and Work Reading: 10: 1-3 Problems: 9: 30, 32, 34, 35 A closed (isolated) system has a total energy E which is constant, but the form of the energy can change. For example, thermal, kinetic, chemical, … We shall be concerned with the conversion of one kind of energy into another and the exchange of energy with the outside world.