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Unformatted text preview: Physics II: Heat & Electromagnetism today: Thermal expansion of solids and liquids Heat capacity Phase changes Physics 213 August 29, 2006 2.1 Thermal expansion of solids and liquids A. A steel plate has a circular hole in the middle. If the plate is heated, the hole will 1. get smaller. 2. get larger. 3. stay the same size. Physics 213 August 29, 2006 2.2 Why do solids and liquids expand as they become hotter? Larger T greater kinetic energy (K) + harder to push together than pull apart Physics 213 August 29, 2006 2.3 Atoms V(d) d What is the change in length ! L of two points a distance L apart on an object which goes from a temperature T to T + ! T ? What is the change in volume of an object? Physics 213 August 29, 2006 2.4 Heat capacity (c) How much heat (energy) Q does it take to raise the temperature of a substance by ! T ? Water : 4190 J/kgK Ice : 2100 J/kgK Cu : 390 J/kgK Physics 213 August 29, 2006 2.5 B. If you add heat to an otherwise insulated container partially Flled with water at...
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