1. AP Physics II.B Temperature and Heat

2. 12.4, 6 Thermal Expansion, Heat and Internal Energy

3. Loosen the lid

4. Factors in linear expansion

5. And the boxer is...

6. Ex. The steel bed of a suspension bridge is 2.00 EE 2 m long at a temperature of 20.0º C. The extremes of temperature to which it is exposed are –30.0º C and 40.0º C. How much will the bridge expand and contract under these conditions?

7. A bimetallic strip

8. Expansion of holes

9. Ex. An iron ring is to fit snugly on a cylindrical rod at 20.0º C. The diameter of the rod is 6.445 cm and the inside diameter of the ring is 6.420 cm. To slip the ring over the rod it must larger than the rod by a diameter of 0.008 cm. At what temperature will the ring fit onto the rod?

10. 12.6 Heat and Internal Energy

11. What is heat?

12. Transfer of energy

13. Internal energies of the atoms and molecules in a substance Translational kinetic energy (movement of a gas molecule or atom) Rotational kinetic energy (molecule spinning around its center of mass) Electrical potential energy (bending and stretching between atoms of a molecule)

14. 13.1-3 Transfer of Heat

15. Conduction – high energy atoms come into contact and therefore transfer energy to low energy atoms

16. Convection (fluids) – replacement of cold matter with hot matter

17. Electromagnetic Radiation – no transfer of matter involved

18. Rev. 99B1; p. 124: 52, 79; p. 207: 7, 10; p. 300: 15, 21 99B1 a) 0.39gEb) 44 Nc) 41 N d) ?e) 360 m d) 0.15 N 52.a) 57 600 Nb) 20 600 N 10. 1.4 m